Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.003 Å; R factor = 0.029; wR factor = 0.072; data-to-parameter ratio = 13.0. The title compound (systematic name (3aR,3bS,11aS,R S )-3a,3b,4,5,11,11a-hexahydro-10- is an enantiopure sulfinyl adduct which represents a 16azasteroid analogue and displays an estrone-like skeleton. The structure exhibits a strong intramolecular hydrogen bond and a C-HÁ Á Á intermolecular interaction. Related literature For related literature, see:

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... versa et al. (2001, 2005). Experimental Crystal data C 33 H 37 NO 5 S M r = 559.70 Monoclinic, P2 1 a = 11.271 (1) Å b = 7.137 (1) Å c = 17.513 (1) Å = 91.620 (1) V = 1408.2 (2) Å 3 Z = 2 Cu K radiation = 1.37 mm À1 T = 100 (2) K 0.28 Â 0.21 Â 0.16 mm Data collection Oxford Diffraction Excalibur PX Ultra CCD diffractometer Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2006) T min = 0.710, T max = 0.803 20509 measured reflections 4772 independent reflections 4326 reflections with I > 2(I) R int = 0.034