3W5E:
reference: Identification of the fused bicyclic 4-amino-2-phenylpyrimidine derivatives as novel and potent PDE4 inhibitors., Goto T, Shiina A, Yoshino T, Mizukami K, Hirahara K, Suzuki O, Sogawa Y, Takahashi T, Mikkaichi T, Nakao N, Takahashi M, Hasegawa M, Sasaki S, Bioorg Med Chem Lett. 2013 Jun 1;23(11):3325-8. doi: 10.1016/j.bmcl.2013.03.104. , Epub 2013 Apr 4. PMID: 23602400

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