Table 1.

Sterols of Petrosia weinbergi

Sterol	HPLC retention time (min)	Abundance
Isofucosterol (14) [22]	51.8	38%
Clionasterol (15) [23]	63.2	29%
Campesterol [24]	57.6	8%
Crinosterol [24]	46.4	7%
(24S,28S)-24,28-Methylene-stigmast-5-en-3-ol (13) [15]	60.8	7%
Poriferasterol (16) [23]	55.8	4%
Brassicasterol [24]	48.4	3%
22-Dehydrocholesterol [24]	42.4	2%
Occelasterol [25]	41.0	1%
(24S)-24-Isopropenylcholesterol [26]	54.0	tr.
4-Demethyl-5-dehydrodinosterol [27]	54.0	tr.