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Chemical structures of cardenolide ouabain (1), bufadienolide bufalin (2), digitoxigenin (3) and its derivative rostafuroxin (4), digoxin (5), oleandrin (6), lanatoside C (7), strophanthidin (8), digitoxin (9), convallatoxin (10), digoxigenin (11), cinobufagin (12), a semisynthetic cardenolide RIDK-34 (13), glucoevatromonoside (14), evomonoside (15), C10 (16), and C11 (17). Compound 1 has a five-membered lactone ring (in red) and compound 2 has a six-membered lactone ring (in blue).
