2-(3-Ethylsulfinylpropyl)-1,2,3,4-tetrahydroisoquinoline 23486-22-8 37517-33-2 ESPROQUIN Esproquina [INN-Spanish] Esproquinum [INN-Latin] Isoquinoline, 2-(3-(ethylsulfinyl)propyl)-1,2,3,4-tetrahydro-