| abstract |
.[.The.]. Phthalide ester of 6-[(D(-)α-aminophenylacetamido] penicillanic acid and intermediates therefor .[.are described.].. The phthalide penicillin ester is orally administrable to provide high serum concentrations of the .Iadd.free acid form of the .Iaddend..[.parent.]. penicillin. n .[.This application is a division of application Ser. No. 259,560 filed June 5, 1972, now U.S. Pat. No. 3,860,579..]. .Iadd. |