5WQA:
reference: The discovery, complex crystal structure, and recognition mechanism of a novel natural PDE4 inhibitor from Selaginella pulvinata., Huang Y, Liu X, Wu D, Tang G, Lai Z, Zheng X, Yin S, Luo HB, Biochem Pharmacol. 2017 Jan 31. pii: S0006-2952(17)30046-1. doi:, 10.1016/j.bcp.2017.01.016. PMID: 28159622

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