4,6-Methano-5H-benz(h)oxazolo(3,2-a)pyrazino(3,2,1-de)(1,5)naphthyridine-10,13-dione, 1,2,3a,4,4a,6,7,9,13b,13c-decahydro-7-hydroxy-9-(hydroxymethyl)-11-methoxy-5,12-dimethyl- 54913-26-7 S-Naphthyridinomycin A