the molecular features for the best activities are a phenyl group in the c-6 position of the 3 ( 2h ) -pyridazinone ring , a four-atom chain length between the 3 ( 2h ) -pyridazinone ring and the 2-cyanoguanidine moiety , and a thioether rather than an ether linkage .
C1521970
features
C1444754
length