70521-94-7 Sesbanine Spiro(cyclopentane-1,4'(1'H)-(2,7)naphthyridine)-1',3'(2'H)-dione, 3-hydroxy-, (1R-trans)- Spiro(cyclopentane-1,4'(1'H)-(2,7)naphthyridine)-1',3'(2'H)-dione, 3-hydroxy-, trans-(+)-