N-Hydroxy-7-(4-methoxyphenoxy)heptanamide-d4 can be obtained from 4-Hydroxyanisole (H750017) which is commonly known as Mequinol, is a topical depigmenting agent that functions as a tyrosinase inhibitor. This is a labeled analog. Molecular Formula: C18H17D6NO4 Molecular Weight: 323.42