Halocynthia roretzi mytiloxanthinone from

Terpene hydroquinones which are well known as constituents of other marine organisms have been isolated from the ascidian Aplidium constellatum, (750). These compounds demonstrated activity as anticancer agents. In the case of A. constellatum, 2-methyl-2-(4-methylpent-3-enyl)-2/f-chromen-6-ol could be identified. Five new carotenoids have been obtained from tunicates, halocynthiaxanthin (1067) (751) and mytiloxanthinone (1068) (752) from Halocynthia roretzi, sidnyax-anthin (1069) from Sidnyum argus (755) and amarouciaxanthin A (1070) and B (1071) from Amaroucium pliciferum (733a). Halocynthia aurantium furnished two known carotenoids, astaxanthin and diatoxan-... [Pg.316]

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