3LY2:
reference: Water-soluble PDE4 inhibitors for the treatment of dry eye., Govek SP, Oshiro G, Anzola JV, Beauregard C, Chen J, Coyle AR, Gamache DA, Hellberg MR, Hsien JN, Lerch JM, Liao JC, Malecha JW, Staszewski LM, Thomas DJ, Yanni JM, Noble SA, Shiau AK, Bioorg Med Chem Lett. 2010 May 1;20(9):2928-32. Epub 2010 Mar 7. PMID: 20378348

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