Hipposudoric acid
Hipposudoric acid is a red pigment found in the skin secretions of the hippopotamus; although the secretions are often known as "blood sweat", they are neither blood nor sweat.
Like its orange-colored analog norhipposudoric acid, hipposudoric acid functions both as a natural sunscreen and as an antimicrobial agent. It is derived from the oxidative dimerization of homogentisic acid.
