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.

5-羟基吲哚乙酸 (5HIAA) 是血清素的分解产物，通过尿液排出。类癌瘤会产生过量的血清素和 5HIAA，可以通过测量尿液中这些物质的水平来检测类癌瘤 (NCI)。

Quassin has female anti-fertility properties, possibly acting via inhibition of estrogen secretion.