4L1B:
reference: Crystal Structures of PI3Kalpha Complexed with PI103 and Its Derivatives: New Directions for Inhibitors Design., Zhao Y, Zhang X, Chen Y, Lu S, Peng Y, Wang X, Guo C, Zhou A, Zhang J, Luo Y, Shen Q, Ding J, Meng L, Zhang J, ACS Med Chem Lett. 2013 Dec 10;5(2):138-42. doi: 10.1021/ml400378e. eCollection, 2014 Feb 13. PMID: 24900786

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