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-7,11-dihydroxy-9-(hydroxymethyl)-5,12-dimethyl-, (3aS-(3aalpha,4alpha,4abeta,6alpha,7beta,9alpha,13bbeta,13cbeta))-