Solorinic acid is an anthraquinone pigment found in the leafy lichen Solorina crocea.

It is responsible for the strong orange colour of the medulla and the underside of the thallus in that species.

In its purified crystalline form, it exists as orange-red crystals with a melting point of 201 °C (394 °F).

[1] The structure of solorinic acid, 2-n-hexanoyl-1,3,8-trihydroxy-6-methoxy-anthraquinone, was proposed by Koller and Russ in 1937,[2] and verified by chemical synthesis in 1966.

[3] Norsolorinic acid, (C20H18O7, 2-hexanoyl-1,3,6,8-tetrahydroxyanthraquinone), is a closely related compound also found in Solorina crocea.