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The formation of 6-membered ring with the ketone (D ring) was also confirmed by the HMBC correlations from the protons of two germinal methyls H3-21 and 22 (δH 1.21 and 1.12, respectively) to C-11 (δC 78.2), C-13 (δC 53.1), and C-14 (δC 218.0) and from H-15 (δH ...