CNC(=O)CN1CC(C(=O)Nc2cncc3ccc(NS(C)(=O)=O)c(F)c23)c2cc(Cl)ccc2C1=O
CNC(=O)CN1CC(C(=O)Nc2cncc3cc(F)c(NS(C)(=O)=O)cc23)c2cc(Cl)ccc2C1=O
CNC(=O)CN1CC(C(=O)Nc2cncc3ccc(NS(C)(=O)=O)c(OC)c23)c2cc(Cl)ccc2C1=O
CNC(=O)CN1CC(C(=O)Nc2cncc3cc(OC)c(NS(C)(=O)=O)cc23)c2cc(Cl)ccc2C1=O
Masking a H bond is another tactic for reducing efflux. This can be achieved with a heteroatom EWG such as F or other groups such as OMe.