1 SK2 (3r)-methylcarbamoyl-7-sulfoamino-3,4-dihydro-1h-isoquinoline-2-carboxylic acid benzyl ester 1.000 2 1C2 3(S)-methylcarbamoyl-7-sulfoamino-3,4-dihydro-1h-isoquinoline-2-carboxylic acid tert-butyl ester 0.719 3 ENT 3(R)-methylcarbamoyl-7-sulfoamino-3,4-dihydro-1h-isoquinoline-2-carboxylic acid tert-butyl ester 0.719