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Structures of (1R,2R,5R)-5-isopropyl-2-methylcyclohexyl phenyl (2-(tert-butylcarbamoyl)phenyl)phosphoramidate (17), (3S,5S,8R,9S,10S,13R,14S,17R)-10,13-dimethyl-17-((R)-6-methylheptan-2-yl)hexadecahydro-1H-cyclopenta[a]phenanthren-3-yl phenyl (2-(tert-butylcarbamoyl)phenyl)phosphoramidate (18) synthesized by nitrene insertion from organic azide.
