4-Methylumbelliferyl-α-D-Glucopyranoside (4-Methylumbelliferyl-α-D-Glucose) is a fluorescent substrate for α-glucosidase, which releases the fluorescent moiety 4-methylumbelliferyl (4-MU) upon cleavage. 4-MU has pH-dependent fluorescence excitation activity, with excitation wavelengths of 320 nm at low pH (1.97-6.72) and 360 nm at high pH (7.12-10.3), respectively. The emission wavelength of 4-Methylumbelliferyl-α-D-Glucopyranoside increases with decreasing pH, ranging from 445-455 nm. 4-Methylumbelliferyl-α-D-Glucopyranoside can be used as a biomarker for Fabry and Pompe diseases to quantify α-glucosidase activity in infant blood spot samples.

Sematilide (CK-1752) is a class III antiarrhythmic. It is a selectively delayed rectifier K+ current (IKr) channel blocker.

Norsanguinarine has antifungal activity, it exhibits 100 % inhibition of A. brassicicola and C. maculans at 1000 ppm whereas. It shows significant cytotoxic activities (ED (50) values < 4 microg/ml) against P-388, KB16, A549, and HT-29 cell lines.