CN1CCN(C(=O)C2C[C@@H]3CC[C@H](C2)N3C(=O)CCl)CC1
CN1CCN(C(=O)c2ccc3c(c2)CCN(C(=O)CCl)C3)CC1
Try to increase lipophilicity of the central core of (e.g. 1380) while growing molecule to reach new pockets. Potential interaction of N-methylpiperazine with Asp187