boracic acid

“He could put up with the loss of supplies of things like iodine and calamine lotion, since there were alternatives that worked just as well, but there had been no supply of boracic acid ever since the outbreak of the war, since that particular substance had always come from the volcanic steam of Tuscany; it was the best drug he knew of for coping with infections of the bladder and foulness of the urine.”

Captain Corelli's Mandolin