22973-05-3 ISOQUINOLINE, 1-(2-((p-CHLOROPHENYL)SULFINYL)ETHYL)-1,2,3,4-TETRAHYDRO-6,7-DIMET Isoquinoline, 1-(2-((p-chlorophenyl)sulfinyl)ethyl)-1,2,3,4-tetrahydro-6,7-dimethoxy-2-methyl-, fumarate (1:1)