Cysteine sulfinic acid is an amino acid containing a sulfinic acid functional group. It is a white solid that is soluble in water. It is an intermediate in cysteine metabolism. It is not a coded amino acid, but is produced post-translationally. Its formation is catalyzed by the enzyme cysteine dioxygenase.

CAS：2381-08-0
中文别名：
英文别名：DL-Cysteinsulfinsaeure;Alanine,3-sulfino;cysteinesulfinic acid;Cysteine hydrogen sulfite ester;Alanine 3-sulfinic acid;Alanin-3-sulfinsaeure;Cysteine sulfinate;Cysteino-sulfinsaeure;
分子式：C2H7NO2S2
分子量：141.212
精确质量：140.992
Psa：121.33
Logp：0.9887

密度：1.828g/cm3
沸点：492.8ºC at 760mmHg
闪点：251.8ºC