Table 2.

Structures of diterpenoids.

	R1	R2	R3	R4		R1	R2	R3	R4		R1	R2	R3	R4
1	H	OH	OAc	H	9	OH	OAc	OH	H	23	H	OH	OAc	OH
2	H	OH	OH	H	10	H	OH	OH	H	24	H	H	OH	OH
3	H	OH	OH	OH	11	H	OAc	OH	H	25	H	H	OH	OAc
4	OH	OH	OH	H	12	H	OH	OAc	H	26	H	H	OAc	OH
5	OH	OH	OH	H	13	OH	OH	OH	H	27	OH	H	H	OAc
6	OAc	OH	OH	H	14	H	OH	OAc	β-OH
7	H	H	OAc	H	15	H	OH	OAc	α-OH
8	H	OH	H	H	16	H	OH	OH	β-OH
					17	OAc	OH	OH	H
					18	OH	H	H	H
					19	OH	H	OH	H
					20	OH	OH	H	H
					21	H	OH	H	H
					22	OAc	OAc	OAc	H