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Figure 1: Chemical structures of -(2-methylbut-2(Z)-enoyl)- 3,4,15,16-bis-epoxy-8,10H-ent-cleroda-13(16),14-dien-20, 12-olide (A), 10-hydroxy-6-x - 4,15,16-bis-epoxy-8H-cleroda- 13(16),14-dien-20,12-olide (B) and spinasterol (C)

Figure 1: Chemical structures of  -(2-methylbut-2(Z)-enoyl)- 3,4,15,16-bis-epoxy-8,10H-ent-cleroda-13(16),14-dien-20, 12-olide (A), 10-hydroxy-6-x -  4,15,16-bis-epoxy-8H-cleroda- 13(16),14-dien-20,12-olide (B) and spinasterol (C)