Instructions: Given a title, list of keywords and main findings, create an abtract for a scientific article. Sequence of molecules like "molecule A, molecule B, molecule C, molecule D" must be writen in the contracted form "molecules A-D".
Input: Title: Configurational assignment of cyclic peroxy metabolites provides an insight into their biosynthesis: isolation of plakortolides, seco-plakortolides, and plakortones from the Australian marine sponge Plakinastrella clathrat. Keywords: Australian sponge, relative configurational assignment, spectroscopic analysis, absolute configurations, (1)H NMR analysis, polyketide-derived precursor. Main findings: Plakinastrella clathrata produces plakortolide C. Plakinastrella clathrata produces plakortolide D Plakinastrella clathrata produces plakortolide E, Plakinastrella clathrata produces plakortolide F. Plakinastrella clathrata produces plakortolide G, Plakinastrella clathrata produces plakortolide H. Plakinastrella produces some seco-plakortolides. Plakinastrella produces some plakortones. Plakinastrella clathrata produces 6-hydroperoxydienoic acid.
Abstract: Provide your response in exactly 6 paragraphs (separated nearby paragraphs with 3 aterisk symbols ***).
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