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Structures of chemical compounds 15–19. 15: nerolidol-3-O-α-l-rhamnopyranosyl(1,4)-α-l-rhamnopyranosyl(1,2)-[α-l-rhamnopyranosyl(1,6)]-β-d-glucopyranoside; 16: cinchonain Ib; 17: 3-epicorosolic acid methyl ester; 18: 2-α hydroxy-3-oxo urs-12-en-28-oic acid; 19: tormentic acid methyl ester.
