CNC(=O)Cc1c(C)cccc1CN1CCN(C(=O)CCl)CC1
Covalent fragment 0692 was expanded with N-methylacetamide, which induces hydrogen bonding between the additional amide oxygen atom and protonated, non-acetylated, piperazine nitrogen atom. The additional amide oxygen atom furthermore binds to Asn142. Should the intramolecular hydrogen bond also be the predominant species in solution, this preorganisation can putatively improve binding affinity. The compound was designed in SeeSAR.