C004019 is a small molecule PROTAC capable of targeting tau for selective protein degradation from the cell, while recruiting tau and E3 ligase (Vhl) for selective enhancement of tau ubiquitination and proteollyzation. C004019 is a candidate for AD and related tau protein diseases.

6-Bromoindole-3-acetonitrile is a marine derived natural products found in Pseudosuberites hyalinus.

4-Azido-L-phenylalanine hydrochloride is an unnatural amino acid. It is used as an effective vibrational reporter of local protein environments.