28978-07-6 7-Oxabicyclo[4.1.0]heptane-2-propanoic acid, .alpha.-amino-5-oxo-, (1R-(1.alpha.,2.alpha.(S*),6.alpha.))- 7-Oxabicyclo[4.1.0]heptane-2-propanoic acid, .alpha.-amino-5-oxo-, [1R-[1.alpha.,2.alpha.(S*),6.alpha.]]- ANTICAPSIN NSC177854