Fused pyridine derivatives R 0450Hydantoins and Thiohydantoins Derived from 1,2,3,4-Tetrahydroisoquinoline-3-carboxylic Acid. -The title compounds are prepared in chiral form in high yields. -(JANSA, P.; WSOL, V.; BERTOLASI, V.; MACHACEK*, V.; Heterocycles 68 (