(S)-2-[4-(1,3-Diamino-5,6,6a,7,8,9-hexahydro-pyrimido[5,4-e]indolizin-8-yl)-benzoylamino]-pentanedioic acid diethyl ester
dimethyl 4-amino-4-deoxy-10-carboxytetrahydro-8,10-dideazapteroate
methyl 4-amino-4-deoxy-5,10-carbonyl-5,6,7,8-tetrahydro-8,10-dideazapteroate
methyl 4-amino-4-deoxy-5,10-methylene-5,6,7,8-tetrahydro-8,10-dideazapteroate
4-amino-4-deoxy-5,10-methylene-5,6,7,8-tetrahydro-8,10-dideazapteroic acid