MK-801 is a potent, selective and non-competitive NMDA receptor antagonist with Kd of 37.2 nM in rat brain membranes.

A tetraiodofluorescein used as a red coloring in some foods (cherries, fish), as a disclosure of DENTAL PLAQUE, and as a stain of some cell types. It has structural similarity to THYROXINE.

7-Acetoxy-4-methylcoumarin is a fluorogenic substrate for carboxylesterase yielding a blue fluorescent solution upon cleavage.