SARCOSINE CRESOL RED

3,3'-BIS[[N-METHYL-N-(CARBOXYMETHYL)]AMINOMETHYL]-O-CRESOLSULFONPHTHALEIN MONOSODIUM SALT

N,N'-[3H-2,1-benzoxathiol-3-ylidenebis[(6-hydroxy-5-methylphen-3,1-ylene)methylene]]bis[N-methylglycine] S,S-dioxide