Inhibitory potencies of 4-(phthalazin-1-yl)amino-benzenesulfonamide derivatives at human NPP3.

	Compd.	R1	R2	K i ± SEM (nM)
	6g		--CH3	29 900 ± 3400
	11		--H	74 200 ± 6800
	15		--H	80 700 ± 9900
	34			20 100 ± 800
	35			19 700 ± 1100
	36			30 900 ± 1400
	37	--CH3		60 700 ± 3500
	38	--Cl		40 200 ± 2100
	39	---F		50 900 ± 3400
	40	--OH		35 100 ± 1200