Table 1.

Structures of avarol, 1, the sesquiterpene hydroxyquinones/ amino-quinones/hydroquinones 2 – 9 and bolinaquinone, 10.

Name	Drimane rearranged decalin ring	X	R1	R2
(1) [1, 2] Dysidea avara			H	H
(2) [3, 4] Rhopaloeides sp.			OH	OCH3
(3) [22] Smenospongia sp.			OH	OH
(4) [22, 23] Smenospongia sp.			OH	OCH2CH3
(5) [22] Smenospongia sp.			OH	NH(CH2)2C6H5
(6) [22] Smenospongia sp.			OH	NH(CH2)2CH(CH3)2
(7) [22] Smenospongia sp.			OH	NHCH2CH(CH3)2
(8), [24] Rhopaloeides sp.			-	-
(9) [25] Rhopaloeides sp.			-	-
(10) [26] Dysidea sp.			OH	OCH3