5U13:
reference: 8-Mercaptoguanine derivatives as inhibitors of dihydropteroate synthase., Swarbrick J, Dennis M, Lee M, Harjani J, Ahmed M, Debono A, Pitcher N, Wang ZC, Chhabra S, Barlow N, Rahmani R, Cleary B, Dolezal O, Hattarki M, Aurelio L, Shonberg J, Graham B, Peat T, Baell J, Chemistry. 2017 Nov 24. doi: 10.1002/chem.201704730. PMID: 29171692

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