Depigmentation from squaric acid dibutylester.
D000328:Adult; D003503:Cyclobutanes / Q000009:adverse effects* / Q000627:therapeutic use; D003877:Dermatitis, Contact / Q000209:etiology; D003875:Drug Eruptions / Q000209:etiology; D006801:Humans; D008297:Male; D010859:Pigmentation Disorders / Q000139:chemically induced*
D003503:Cyclobutanes; C020637:squaric acid dibutyl ester