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Ov. Gulyakevich et al., FUNCTIONALIZATION OF 8-AZA-D-HOMOGONA-1,3 ,5(10),13-TETRAEN-12,17-ALPHA-DIONES AT POSITION-11 AND POSITION-17 UNDER CONDITIONS OF THE CLAISEN ESTER CONDENSATION - SYNTHESIS AND PROPERTIES OF 11-ACYLSUBSTITUTEDAND 17-ACYLSUBSTITUTED 8-AZA-D-HOMOGONANES, Himia geterocikliceskih soedinenij, (7), 1995, pp. 959-965