O=C(Cc1cc(Cl)ccn1)Nc1cncc2ccccc12
Regioisomer of MAT-POS-afd4d4fd-2 in which pyridine nitrogen is moved to a more solvent-exposed position (helps with aqueous solubility). Aza-substitution of chlorobenzene will modulate chlorine electronics (weakens the already weak hydrogen bond acceptor strength of the chlorine while making it a better halogen bond donor).