Pirazol

El pirazol es un compuesto de anillo de cinco miembros con dos átomos de nitrógeno adyacentes. Se utiliza en la síntesis de productos farmacéuticos y agroquímicos, particularmente por sus propiedades antiinflamatorias y antipiréticas. En CymitQuimica, ofrecemos una variedad de pirazoles de alta calidad para apoyar sus proyectos de investigación e industriales.

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productos por página. Hay 17121 productos en esta categoría.

Datos del producto	Pureza	Rango de precios	Entrega estimada
5-(6-Methoxynaphthalen-2-yl)-1H-pyrazole-3-carboxylic acid REF: 10-F077172CAS: 1257877-12-5	95.0%	A consultar	Mar 18 Feb 25
1,5-Dimethyl-1H-pyrazole-3-carbonyl chloride REF: 10-F017176CAS: 49783-84-8	95.0%	A consultar	Mar 18 Feb 25
3-(2,6-Difluorophenyl)-1H-pyrazole REF: 10-F068647CAS: 154258-88-5	97.0%	A consultar	Mar 18 Feb 25
1-(2-phenylethyl)-1H-pyrazol-3-amine REF: 10-F524933CAS: 876343-25-8	95.0%	A consultar	Mar 18 Feb 25
1-methyl-5-nitro-1H-pyrazole-3-carbonitrile REF: 10-F428758CAS: 1245772-35-3	95.0%	A consultar	Mar 18 Feb 25
1-isopropyl-1H-pyrazole-3-carbaldehyde REF: 10-F428938CAS: 1226694-29-6	95.0%	A consultar	Mar 18 Feb 25
5-Bromo-1,3-dimethyl-1H-pyrazole REF: 10-F218248CAS: 5744-70-7	97.0%	A consultar	Mar 18 Feb 25
3-Amino-4-iodo-1H-pyrazole REF: 10-F046451CAS: 81542-51-0	95.0%	A consultar	Mar 18 Feb 25
N-methyl-3-(1H-pyrazol-1-yl)propan-1-amine REF: 10-F309858CAS: 1007488-78-9	95.0%	A consultar	Mar 18 Feb 25
1-(2-morpholin-4-ylethyl)-1H-pyrazol-4-amine dihydrochloride REF: 10-F515297CAS: 1351658-98-4	95.0%	A consultar	Mar 18 Feb 25
5-Chloro-3-methyl-1H-pyrazole REF: 10-F214608CAS: 15953-45-4	95.0%	A consultar	Mar 18 Feb 25
5-Isopropyl-1H-pyrazole REF: 10-F064463CAS: 49633-25-2	95.0%	A consultar	Mar 18 Feb 25
[4-(1H-Pyrazol-1-yl)phenyl]methanol REF: 10-F036221CAS: 143426-49-7	95.0%	A consultar	Mar 18 Feb 25
(E)-ETHYL 3-(1-METHYL-1H-PYRAZOL-4-YL)ACRYLATE REF: 10-F506275CAS: 192661-36-2	95.0%	A consultar	Mar 18 Feb 25
5-Amino-1-(4-fluorophenyl)-1H-pyrazole-4-carbohydrazide REF: 10-F033554CAS: 618070-67-0	99.0%	A consultar	Mar 18 Feb 25
N-methyl-N-[(5-methyl-1-phenyl-1H-pyrazol-4-yl)methyl]amine REF: 10-F518928CAS: 1031843-22-7	- - -	A consultar	Mar 18 Feb 25
Methyl 2-[5-(furan-2-yl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]benzoate REF: 10-F475823CAS: 228259-40-3	95.0%	A consultar	Mar 18 Feb 25
1-Butyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole REF: 10-F621265CAS: 1488423-70-6	98%	A consultar	Mar 18 Feb 25
2-Benzyl-4-bromo-1-methyl-1H-pyrazol-3(2H)-one REF: 10-F690501CAS: 51620-31-6	97%	A consultar	Mar 18 Feb 25
1-(4-Methyl-benzyl)-1H-pyrazole-4-carboxylic acid ethyl ester REF: 10-F317657	95.0%	A consultar	Mar 18 Feb 25
Ethyl 1-methyl-1H-pyrazole-3-carboxylate REF: 10-F329710CAS: 88529-79-7	95.0%	A consultar	Mar 18 Feb 25
5-chloro-1-(4-chlorophenyl)-3-propyl-1H-pyrazole-4-carbaldehyde REF: 10-F522200CAS: 1152959-94-8	95.0%	A consultar	Mar 18 Feb 25
3-(1,3,5-trimethyl-1H-pyrazol-4-yl)propanoic acid hydrochloride REF: 10-F358756CAS: 1269087-62-8	95.0%	A consultar	Mar 18 Feb 25
4-BROMO-1-(TRIFLUOROMETHYL)-1H-PYRAZOLE REF: 10-F504555CAS: 1046831-97-3	95.0%	A consultar	Mar 18 Feb 25
4-Iodo-1,3,5-trimethyl-1H-pyrazole REF: 10-F718630CAS: 51660-65-2	95+%	A consultar	Mar 18 Feb 25
1-(4-Methyl-benzyl)-1 H -pyrazol-3-ylamine REF: 10-F030622CAS: 492426-22-9	95.0%	A consultar	Mar 18 Feb 25
1-(2-Methoxyphenyl)-3-(trifluoromethyl)-1H-pyrazole-5-carboxylic acid REF: 10-F476388	- - -	A consultar	Mar 18 Feb 25
1-(4-Bromophenyl)-3,5-dimethyl-1H-pyrazole-4-carboxylic acid REF: 10-F316797CAS: 113808-88-1	95.0%	A consultar	Mar 18 Feb 25
5-Amino-1-(2,6-dimethyl-phenyl)-1H-pyrazole-4-carbonitrile REF: 10-F511312CAS: 792952-99-9	95.0%	A consultar	Mar 18 Feb 25
Methyl 5-(chlorocarbonyl)-1-methyl-1H-pyrazole-3-carboxylate REF: 10-F319223CAS: 203792-49-8	95.0%	A consultar	Mar 18 Feb 25
4-Bromo-1-(3-fluorophenyl)-1H-pyrazole REF: 10-F762533CAS: 1353856-11-7	97%	A consultar	Mar 18 Feb 25
1-Benzyl-1H-pyrazole-5-carboxylic acid REF: 10-F550694CAS: 87581-74-6	>95%	A consultar	Mar 18 Feb 25
5-Amino-1-(4-methylphenyl)pyrazole-4-carboxylic acid REF: 10-F493967CAS: 14678-93-4	95.0%	A consultar	Mar 18 Feb 25
5-Amino-3-methyl-1-(3-trifluoromethyl-phenyl)-1H-pyrazole-4-carbonitrile REF: 10-F521640	95.0%	A consultar	Mar 18 Feb 25
1-(2,6-DIFLUOROPHENYL)-1H-PYRAZOL-3-AMINE REF: 10-F534408CAS: 1511383-48-4	95.0%	A consultar	Mar 18 Feb 25
5-(2-tert-Butoxycarbonylamino-ethyl)-1-(4-nitro-phenyl)-1H-pyrazole-4-carboxylic acid methyl ester REF: 10-F317722	95.0%	A consultar	Mar 18 Feb 25
3-(1,3-benzodioxol-5-yl)-1H-pyrazole hydrochloride REF: 10-F360222CAS: 1269199-66-7	95.0%	A consultar	Mar 18 Feb 25
N,N-dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole-1-sulfonamide REF: 10-F778174CAS: 959585-47-8	98%	A consultar	Mar 18 Feb 25
3-(2,5-Dimethoxyphenyl)-1H-pyrazole-5-carboxylic acid REF: 10-F059433CAS: 882238-14-4	95.0%	A consultar	Mar 18 Feb 25
1,3-Dimethyl-5-trifluoromethyl-1H-pyrazole-4-sulfonyl chloride REF: 10-F521895	95.0%	A consultar	Mar 18 Feb 25
Cyclopropyl(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl)methanone REF: 10-F639446CAS: 2613434-30-1	98%	A consultar	Mar 18 Feb 25
5-Amino-1-methyl-1H-pyrazole-4-carbonitrile REF: 10-F068666CAS: 5334-41-8	97.0%	A consultar	Mar 18 Feb 25
1-(2-Tetrahydropyranyl)-1H-pyrazole REF: 10-F092820CAS: 449758-17-2	97.0%	A consultar	Mar 18 Feb 25
1-(2-Methoxyphenyl)-5-methyl-1H-pyrazole-3-carboxylic acid REF: 10-F096148CAS: 1225539-41-2	- - -	A consultar	Mar 18 Feb 25
5-Amino-1-(3-methoxy-phenyl)-3-methyl-1H-pyrazole-4-carbonitrile REF: 10-F521645	95.0%	A consultar	Mar 18 Feb 25
ethyl 5-(4-methylphenyl)-1H-pyrazole-3-carboxylate REF: 10-F525022CAS: 595610-41-6	95.0%	A consultar	Mar 18 Feb 25
3-(2,4-Dichlorophenyl)-1-methyl-1H-pyrazole-5-carboxylic acid ethyl ester REF: 10-F545717	95%+	A consultar	Mar 18 Feb 25
5-(METHOXYMETHYL)-1-METHYL-1H-PYRAZOLE-4-CARBALDEHYDE REF: 10-F535309	95.0%	A consultar	Mar 18 Feb 25
methyl 3-(3-bromophenyl)-1H-pyrazole-5-carboxylate REF: 10-F495189CAS: 1148158-89-7	95.0%	A consultar	Mar 18 Feb 25
1-((tetrahydro-2H-pyran-4-yl)methyl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole REF: 10-F517000CAS: 1220635-60-8	95.0%	A consultar	Mar 18 Feb 25
5-Amino-3-(2-furyl)pyrazole REF: 10-F017295CAS: 96799-02-9	97.0%	A consultar	Mar 18 Feb 25
(5-Methyl-4-nitro-pyrazol-1-yl)-acetic acid REF: 10-F028135CAS: 1001611-09-1	95.0%	A consultar	Mar 18 Feb 25
1-[1-(2-fluorophenyl)-1H-pyrazol-4-yl]ethanone REF: 10-F308169CAS: 1177325-28-8	95.0%	A consultar	Mar 18 Feb 25
1-Benzyl-1H-pyrazole-4-carbaldehyde REF: 10-F059731CAS: 63874-95-3	95.0%	A consultar	Mar 18 Feb 25
(E)-3-(1-Ethyl-1H-pyrazol-4-yl)-acrylic acid REF: 10-F014012CAS: 304903-09-1	95.0%	A consultar	Mar 18 Feb 25
3-(tert-Butyl)-1-(2-methoxyphenyl)-1H-pyrazol-5-amine REF: 10-F457104CAS: 862368-61-4	95.0%	A consultar	Mar 18 Feb 25
4-(1-Methyl-1H-pyrazol-4-yl)benzoic acid REF: 10-F541484CAS: 199678-06-3	97.0%	A consultar	Mar 18 Feb 25
5-methyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazole-4-carboxylic acid REF: 10-F603333CAS: 186130-62-1	97%	A consultar	Mar 18 Feb 25
1-[(oxolan-2-yl)methyl]-1H-pyrazol-3-amine REF: 10-F524936CAS: 1182793-92-5	95.0%	A consultar	Mar 18 Feb 25
1-{[4-(trifluoromethoxy)phenyl]methyl}-1H-pyrazol-4-amine REF: 10-F525073CAS: 1152841-84-3	95.0%	A consultar	Mar 18 Feb 25
5-amino-3-(4-chlorophenyl)-1H-pyrazole-4-carbonitrile REF: 10-F773798CAS: 42754-62-1	98%	A consultar	Mar 18 Feb 25
2-{[3-(4-Chlorophenyl)-1-phenyl-1H-pyrazol-4-yl]methylidene}-5,5-dimethylcyclohexane-1,3-dione REF: 10-F094194CAS: 313273-04-0	- - -	A consultar	Mar 18 Feb 25
1-Ethyl-1H-pyrazole REF: 10-F068645CAS: 2817-71-2	97.0%	A consultar	Mar 18 Feb 25
3-tert-butyl-4,5-dihydro-1H-pyrazol-5-one REF: 10-F354712CAS: 29211-68-5	95.0%	A consultar	Mar 18 Feb 25
5-(4-Ethoxyphenyl)-2H-pyrazol-3-ylamine REF: 10-F019538CAS: 129117-13-1	95.0%	A consultar	Mar 18 Feb 25
[3-(4-chlorophenyl)-1-phenyl-1H-pyrazol-4-yl]methanol REF: 10-F314621CAS: 36640-39-8	95.0%	A consultar	Mar 18 Feb 25
1-[(4-tert-butylphenyl)methyl]-1H-pyrazol-4-amine REF: 10-F525072CAS: 1152842-20-0	95.0%	A consultar	Mar 18 Feb 25
1-(Difluoromethyl)-1H-pyrazole-4-carbaldehyde REF: 10-F764672CAS: 1216244-84-6	98%	A consultar	Mar 18 Feb 25
1-(5-bromo-2-furoyl)-1H-pyrazole REF: 10-F314808CAS: 551925-55-4	95.0%	A consultar	Mar 18 Feb 25
5-Methoxy-1-methyl-1H-pyrazole REF: 10-F318805CAS: 1350323-88-4	95.0%	A consultar	Mar 18 Feb 25
5-(2,4,6-Triisopropyl-phenyl)-1H-pyrazole-3-carboxylic acid REF: 10-F521982	95.0%	A consultar	Mar 18 Feb 25
3-(5-Methyl-pyrazol-1-yl)-propionic acid REF: 10-F028130CAS: 180741-46-2	95.0%	A consultar	Mar 18 Feb 25
4-Chloro-1H-pyrazole-5-carbonitrile REF: 10-F221148CAS: 36650-75-6	95.0%	A consultar	Mar 18 Feb 25
2-METHYL-2-(4-(4,4,5,5-TETRAMETHYL-1,3,2-DIOXABOROLAN-2-YL)-1H-PYRAZOL-1-YL)PROPANENITRILE REF: 10-F386478CAS: 2095779-29-4	95.0%	A consultar	Mar 18 Feb 25
7-(1-ethyl-5-methyl-1H-pyrazol-4-yl)pyrazolo[1,5-a]pyrimidine-3-carboxylic acid REF: 10-F425678CAS: 1006446-94-1	95.0%	A consultar	Mar 18 Feb 25
5-Amino-1-(4-chlorophenyl)-1H-pyrazole-4-carbohydrazide REF: 10-F033553CAS: 90793-31-0	95.0%	A consultar	Mar 18 Feb 25
[4-bromo-3-(trifluoromethyl)-1H-pyrazol-1-yl]acetic acid REF: 10-F425673CAS: 1006319-26-1	- - -	A consultar	Mar 18 Feb 25
2-Chloro-1-(1-methyl-1h-pyrazol-4-yl)ethan-1-one REF: 10-F674220CAS: 1152550-60-1	95%	A consultar	Mar 18 Feb 25
2-(3-Methyl-1H-pyrazol-1-yl)aniline hydrochloride REF: 10-F075118CAS: 1365988-08-4	95.0%	A consultar	Mar 18 Feb 25
Ethyl 4-iodo-1-(4-methoxybenzyl)-1H-pyrazole-3-carboxylate REF: 10-F511593CAS: 1355249-29-4	97.0%	A consultar	Mar 18 Feb 25
1-(2-fluoroethyl)-4-iodo-1H-pyrazole REF: 10-F429177CAS: 398152-63-1	- - -	A consultar	Mar 18 Feb 25
4-Cyclopropyl-5-[2-(3,5-dimethyl-pyrazol-1-yl)-ethyl]-4H-[1,2,4]triazole-3-thiol REF: 10-F025854CAS: 1002243-90-4	97%	A consultar	Mar 18 Feb 25
4-Nitro-1-(trifluoromethyl)-1H-pyrazole REF: 10-F770995CAS: 1706461-28-0	98%	A consultar	Mar 18 Feb 25
(5-Methyl-1-phenyl-1H-pyrazol-4-yl)-methanol REF: 10-F316942CAS: 153863-35-5	95.0%	A consultar	Mar 18 Feb 25
3-(1-Methyl-1 H -pyrazol-3-yl)-3-oxo-propionic acid ethyl ester REF: 10-F027093CAS: 958132-55-3	- - -	A consultar	Mar 18 Feb 25
1-4-[(5-Amino-1H-pyrazol-1-yl)methyl]piperidin-1-ylethan-1-one REF: 10-F097409CAS: 1448855-42-2	- - -	A consultar	Mar 18 Feb 25
5-BROMO-1,4-DIMETHYL-1H-PYRAZOLE REF: 10-F503416CAS: 1393583-34-0	95.0%	A consultar	Mar 18 Feb 25
Methyl 5-hydroxy-pyrazole-3-carboxylate REF: 10-F050091CAS: 1018446-60-0	95.0%	A consultar	Mar 18 Feb 25
(4-Benzhydrylpiperazin-1-yl)(1,5-dimethyl-1H-pyrazol-3-yl)methanone REF: 10-F547153CAS: 958323-31-4	98.0%	A consultar	Mar 18 Feb 25
1-(tert-Butyl)-1H-pyrazole REF: 10-F208717CAS: 15754-60-6	95.0%	A consultar	Mar 18 Feb 25
3-(4-ethylphenyl)-1H-pyrazole-5-carboxylic acid REF: 10-F308793CAS: 1197631-25-6	95.0%	A consultar	Mar 18 Feb 25
1-(TETRAHYDROFURAN-3-YL)-4-(4,4,5,5-TETRAMETHYL-1,3,2-DIOXABOROLAN-2-YL)-1H-PYRAZOLE REF: 10-F331696CAS: 1029715-63-6	95.0%	A consultar	Mar 18 Feb 25
5-Phenylthio-2-aminobenzimidazole REF: TR-P337725CAS: 53065-28-4	- - -	287,00 €~1.906,00 €	Mar 18 Feb 25
4-Bromo-1-trityl-1H-pyrazole REF: 10-F220388CAS: 95162-14-4	95.0%	A consultar	Mar 18 Feb 25
2-Pyridin-2-yl-2H-pyrazol-3-ylamine REF: 10-F070009CAS: 89977-46-8	- - -	A consultar	Mar 18 Feb 25
(4-Iodo-1,3-dimethyl-1H-pyrazol-5-yl)methanol REF: 10-F613847CAS: 1356998-41-8	97%	A consultar	Mar 18 Feb 25
1-isobutyl-1H-pyrazole REF: 10-F427090CAS: 725746-81-6	- - -	A consultar	Mar 18 Feb 25
3-Phenyl-1H-pyrazole-5-carboxylic acid REF: 10-F028300CAS: 5071-61-4	95.0%	A consultar	Mar 18 Feb 25
2-BROMO-1-(1-(TERT-BUTYL)-3-CYCLOPROPYL-1H-PYRAZOL-5-YL)ETHAN-1-ONE REF: 10-F535339CAS: 1172850-55-3	95.0%	A consultar	Mar 18 Feb 25
3-(3-nitro-1H-pyrazol-1-yl)propanenitrile REF: 10-F366189CAS: 1006568-14-4	- - -	A consultar	Mar 18 Feb 25

1g		A consultar
100mg		A consultar
250mg		A consultar
500mg		A consultar

1g		A consultar
5g		211,00 €
10g		362,00 €
25g		A consultar
250mg		A consultar

1g		A consultar
50mg		A consultar
100mg		A consultar
250mg		A consultar

1g		783,00 €
5g		1.625,00 €
10g		A consultar
100mg		243,00 €
250mg		366,00 €
500mg		A consultar

5mg		A consultar
10mg		A consultar
25mg		A consultar
50mg		A consultar
100mg		A consultar
250mg		A consultar

Pirazol

5-(6-Methoxynaphthalen-2-yl)-1H-pyrazole-3-carboxylic acid

Ref: 10-F077172

1,5-Dimethyl-1H-pyrazole-3-carbonyl chloride

Ref: 10-F017176

3-(2,6-Difluorophenyl)-1H-pyrazole

Ref: 10-F068647

1-(2-phenylethyl)-1H-pyrazol-3-amine

Ref: 10-F524933

1-methyl-5-nitro-1H-pyrazole-3-carbonitrile

Ref: 10-F428758

1-isopropyl-1H-pyrazole-3-carbaldehyde

Ref: 10-F428938

5-Bromo-1,3-dimethyl-1H-pyrazole

Ref: 10-F218248

3-Amino-4-iodo-1H-pyrazole

Ref: 10-F046451

N-methyl-3-(1H-pyrazol-1-yl)propan-1-amine

Ref: 10-F309858

1-(2-morpholin-4-ylethyl)-1H-pyrazol-4-amine dihydrochloride

Ref: 10-F515297

5-Chloro-3-methyl-1H-pyrazole

Ref: 10-F214608

5-Isopropyl-1H-pyrazole

Ref: 10-F064463

[4-(1H-Pyrazol-1-yl)phenyl]methanol

Ref: 10-F036221

(E)-ETHYL 3-(1-METHYL-1H-PYRAZOL-4-YL)ACRYLATE

Ref: 10-F506275

5-Amino-1-(4-fluorophenyl)-1H-pyrazole-4-carbohydrazide

Ref: 10-F033554

N-methyl-N-[(5-methyl-1-phenyl-1H-pyrazol-4-yl)methyl]amine

Ref: 10-F518928

Methyl 2-[5-(furan-2-yl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]benzoate

Ref: 10-F475823

1-Butyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole

Ref: 10-F621265

2-Benzyl-4-bromo-1-methyl-1H-pyrazol-3(2H)-one

Ref: 10-F690501

1-(4-Methyl-benzyl)-1H-pyrazole-4-carboxylic acid ethyl ester

Ref: 10-F317657

Ethyl 1-methyl-1H-pyrazole-3-carboxylate

Ref: 10-F329710

5-chloro-1-(4-chlorophenyl)-3-propyl-1H-pyrazole-4-carbaldehyde

Ref: 10-F522200

3-(1,3,5-trimethyl-1H-pyrazol-4-yl)propanoic acid hydrochloride

Ref: 10-F358756

4-BROMO-1-(TRIFLUOROMETHYL)-1H-PYRAZOLE

Ref: 10-F504555

4-Iodo-1,3,5-trimethyl-1H-pyrazole

Ref: 10-F718630

1-(4-Methyl-benzyl)-1 H -pyrazol-3-ylamine

Ref: 10-F030622

1-(2-Methoxyphenyl)-3-(trifluoromethyl)-1H-pyrazole-5-carboxylic acid

Ref: 10-F476388

1-(4-Bromophenyl)-3,5-dimethyl-1H-pyrazole-4-carboxylic acid

Ref: 10-F316797

5-Amino-1-(2,6-dimethyl-phenyl)-1H-pyrazole-4-carbonitrile

Ref: 10-F511312

Methyl 5-(chlorocarbonyl)-1-methyl-1H-pyrazole-3-carboxylate

Ref: 10-F319223

4-Bromo-1-(3-fluorophenyl)-1H-pyrazole

Ref: 10-F762533

1-Benzyl-1H-pyrazole-5-carboxylic acid

Ref: 10-F550694

5-Amino-1-(4-methylphenyl)pyrazole-4-carboxylic acid

Ref: 10-F493967

5-Amino-3-methyl-1-(3-trifluoromethyl-phenyl)-1H-pyrazole-4-carbonitrile

Ref: 10-F521640

1-(2,6-DIFLUOROPHENYL)-1H-PYRAZOL-3-AMINE

Ref: 10-F534408

5-(2-tert-Butoxycarbonylamino-ethyl)-1-(4-nitro-phenyl)-1H-pyrazole-4-carboxylic acid methyl ester

Ref: 10-F317722

3-(1,3-benzodioxol-5-yl)-1H-pyrazole hydrochloride

Ref: 10-F360222

N,N-dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole-1-sulfonamide

Ref: 10-F778174

3-(2,5-Dimethoxyphenyl)-1H-pyrazole-5-carboxylic acid

Ref: 10-F059433

1,3-Dimethyl-5-trifluoromethyl-1H-pyrazole-4-sulfonyl chloride