trans-Urocanic Acid ((E)-Urocanic acid), a compound predominantly distributed in the hippocampus and prefrontal cortex, is an isomer of cis-UCA, an epidermal UV-protectant, which enhances the stability of tenofovir eplerenomide in long-acting HIV applications.

H-Ala-Tyr-OH is a tyrosine derivative.

N-terminally acetylated Leu-enkephalin is the N-terminally acetylated form of Leu-enkephalin.