human
Instructions: Given some example of real abstract, a title, list of keywords and main findings, create an abstract for a scientific article about the discovery of new natural products. Start by mentioning the total number of isolated compounds, then detail the complete list of compounds produced by each organisms. 
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-H, 6-hydroperoxydienoic acid. 4 seco-plakortolides were isolated from Kitagawia praeruptora. Praeroside VI, Isofraxidin and Scopoletin were isolated from Kitagawia praeruptora. Kitagawia praeruptora produces 12 coumarins.
Abstract:
gpt
--- Reasoning ---
1. Is the question multiple-choice question?
No
2. Is it implied multiple-choice question?
No
3. If two experts were independently asked the question, will the final answer be exactly the same?
No

--- Answer ---
open