{[(2R,2aR,4aR,7aS,7bS)-2-Methoxy-6-(3-nitro-phenyl)-4-oxo-2a,4,4a,7b-tetrahydro-2H-1,3,7-trioxa-cyclopenta[cd]indene-7a-carbonyl]-amino}-acetic acid benzyl ester

(E)-5,5'-bis-(3-nitro-phenyl)-[3,3']bifurylidene-2,2'-dione