Wiktionary
gallacetophenone
n. (context medicine English) A yellowish-brown trioxyacetophenone powder with parasiticide and antiseptic qualities employed externally in the treatment of psoriasis and other skin diseases.
Wikipedia
Gallacetophenone
Gallacetophenone is the acetyl derivative of pyrogallol. It can be synthesized from pyrogallol using zinc chloride and acetic anhydride.