1,2,3,4 Tetrahydro-2-(3-mercapto-1-oxopropyl)-1-isoquinolinecarboxylic acid 1-Isoquinolinecarboxylic acid, 1,2,3,4-tetrahydro-2-(3-mercapto-1-oxopropyl)- 92932-75-7 EU 4881 EU-4881