gallacetophenone

from The Century Dictionary.

• noun A pale yellow powder, CH₃.CO.C₆H₂(OH)₃, known commonly as alizarin yellow C: employed in dermatology.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun medicine A yellowish-brown trioxyacetophenone powder with parasiticide and antiseptic qualities employed externally in the treatment of psoriasis and other skin diseases.