(3aR,3bR,7aR,8aR)-2,2-Dimethyl-3a,5,7a,8a-tetrahydro-3bH-1,3,8-trioxa-4-aza-cyclopenta[a]indene-4-carboxylic acid benzyl ester

(3aR,3bR,6R,7R,7aS,8aR)-6,7-Dihydroxy-2,2-dimethyl-hexahydro-1,3,8-trioxa-4-aza-cyclopenta[a]indene-4-carboxylic acid benzyl ester