The crystal structure of 1

2-epoxysuberogorgin （Ⅱ ）

a new derivative of a natural product suberogorgin （Ⅰ ）

has been analyzed. The compound crystallizes with the formula C

15

H

20

O

4

. H

2

O

M= 282.34 and the space group P2

1

2

1

2

1

=9. 373（1）

b=10.865（1）

c=14 .350（2）A

V=1461

3A

Z=4. D

x

=1.285g·cm

.

and （000） = 608.00.The structure has been refined fo a filial R-factor=0.0547 for 1463 independently observed reflexions （|F

o

|≥3σ |F

o

|）:All the hydrogen atoms are found from the difference Fourier map