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Figure 4
The E-ring substituent conformation in (a) aza­lactone (I)[link] and (b) carbamate (II)[link]. The isobutyl group of (I)[link] is oriented away from the longitudinal axis of the steroid ring system, while the methyl penta­noate group of (II)[link] has free rotation.

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
Volume 68| Part 6| May 2012| Pages o231-o234
doi:10.1107/S0108270112021099
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