2-[3-(ethylsulfinyl)propyl]-1,2,3,4-tetrahydroisoquinoline hydrochloride 23486-22-8 Esproquin hydrochloride Isoquinoline, 2-[3-(ethylsulfinyl)propyl]-1,2,3,4-tetrahydro-, hydrochloride NC-7197 NSC84974