1-(2-Chloro-5-sulfophenyl)-3-methyl-4-(4-sulfophenyl)azo-2-pyrazolin-5-one disodium salt

1-(2-氯-5-磺苯基)-3-甲基-4-(4-磺苯基)偶氮-2-吡唑啉-5-酮二钠

Also known as: Benzenesulfonic acid, 4-chloro-3-[4,5-dihydro-3-methyl-5-oxo-4-[2-(4-sulfophenyl)diazenyl]-1H-pyrazol-1-yl]-, DYE OP 500, 1-(2-Chloro-5-sulfophenyl)-3-methyl-4-(4-sulfophenyl)azo-2-pyrazolin-5-one disodium salt

1-(2-Chloro-5-sulfophenyl)-3-methyl-4-(4-sulfophenyl)azo-2-pyrazolin-5-one disodium salt (CAS 91101-24-5) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C16H11ClN4Na2O7S2 and a molecular weight of 516.84400 g/mol. It is also known as Benzenesulfonic acid, 4-chloro-3-[4,5-dihydro-3-methyl-5-oxo-4-[2-(4-sulfophenyl)diazenyl]-1H-pyrazol-1-yl]- and DYE OP 500. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

91101-24-5

Jingsj CID

J-944018-6

Molecular Formula

C₁₆H₁₁ClN₄Na₂O₇S₂

Chinese Name

1-(2-氯-5-磺苯基)-3-甲基-4-(4-磺苯基)偶氮-2-吡唑啉-5-酮二钠

Molecular Weight

516.84400 g/mol

Category

Pharma Intermediates

Last updated

8/21/2026