6L89:
reference: Cyclin-Dependent Kinase 5 Inhibitor Butyrolactone I Elicits a Partial Agonist Activity of Peroxisome Proliferator-Activated Receptor gamma., Ahn S, Jang DM, Park SC, An S, Shin J, Han BW, Noh M, Biomolecules. 2020 Feb 11;10(2). pii: biom10020275. doi: 10.3390/biom10020275. PMID: 32054125

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