Abstract
As part of an ongoing research program to discover natural products that suppress the hypoxia-activated tumor survival pathways, the lipid extract of the Papua New Guinea marine sponge Diacarnus levii was found to suppress hypoxia-induced HIF-1 activation and hypoxic tumor cell survival. Bioassay-guided isolation of D. levii yielded four new norsesterterpene peroxides, diacarnoxides A - D. Diacarnoxide B exhibits a significantly enhanced ability to suppress the growth of tumor cells under hypoxic conditions.
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