Dictionary.net

• A compound of gallic acid and aniline; a white crystalline substance used as an astringent in eczema and psoriasis.

1900 - A dictionary of medicine and the allied sciences
By Alexander Duane

• A powder, C13H11O4+2H20, containing anilin and gallic acid : used in skin-diseases.

1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland