Hipposudoric acid

Hipposudoric acid is a red pigment found in the skin secretions of the hippopotamus;^[1] although the secretions are often known as "blood sweat" (thus the name "hipposudoric", referring to "hippo sweat"), they are neither blood nor sweat.

Hipposudoric acid

Names
Preferred IUPAC name 3-(Carboxymethyl)-5-hydroxy-1,4,8-trioxo-4,8-dihydro-1H-fluorene-9-carboxylic acid
Identifiers
CAS Number	851367-73-2 N
3D model (JSmol)	Interactive image
ChemSpider	26546345 Y
PubChem CID	71308217
CompTox Dashboard (EPA)	DTXSID90745438
InChI InChI=1S/C16H8O8/c17-6-1-2-7(18)11-10(6)13-12(14(11)16(23)24)8(19)3-5(15(13)22)4-9(20)21/h1-3,17H,4H2,(H,20,21)(H,23,24) Y Key: JTNHFMSBPHUJFI-UHFFFAOYSA-N Y
SMILES O=C1C=CC(O)=C2C(C(C(CC(O)=O)=CC3=O)=O)=C3C(C(O)=O)=C12
Properties
Chemical formula	C16H8O8
Molar mass	328.232 g·mol−1
Appearance	Red
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Like its orange-colored analog norhipposudoric acid, hipposudoric acid functions both as a natural sunscreen and as an antimicrobial agent.^[2] It is derived from the oxidative dimerization of homogentisic acid.^[3]

It has been both widely and falsely reported that hipposudoric acid colors hippo milk pink. This is not the case; hippo milk is white or beige in color.^[4]

Norhipposudoric acid