The present invention relates to double prodrugs of pharmacologically active glycoprotein IIb/IIIa antagonists of the formula ##STR1## wherein R.sub.1 is selected from the group consisting of lower alkyl of about 2 to about 8 carbon atoms, cycloalkyl, and aralkyl; R is selected from the group consisting of alkoxy, ##STR2## wherein R.sup.50 is H or alkyl; and ##STR3## wherein R.sup.50 is H or alkyl; and pharmaceutically acceptable salts thereof.