N,N′-((2aS,2a1R,4S,4aS,6S,7S,7aS)-6,7-dihydroxy-4-methoxy-6-methyl-2-oxooctahydro-2H-1,3-dioxacyclopenta[cd]inden-2a1-yl)bis-carbamic acid C,C′-bis(1,1-dimethylethyl) ester

(4S,4aS,6S,7S,10S,10aR,11S)-2-(amino-15N)-6,11-dihydroxy-6-methyl-1,4,4a,5,6,7-hexahydro-4,10-epoxy-7,10a-methanooxocino[4,5-d]pyrimidin-9(10H)-one-3-15N