5,10b:11,4b-Bis(iminoethano)dibenzo[c,h][2,6]naphthyridine, 5,6,11,12-tetrahydro-13,18-dimethyl- 5,10b:11,4b-Bis(iminoethano)dibenzo[c,h][2,6]naphthyridine, 5,6,11,12-tetrahydro-13,18-dimethyl-, [4bS-(4b.alpha.,5.alpha.,10b.alpha.,11.alpha.)]- 595-05-1 CALYCANTHINE NSC99016