“…XLVI (R = H), when fused with alkali, gives 8-amino-l-naphthol, and at higher temperatures 1,8-dihydroxynaphthalene is obtained (16). is heated with 20 per cent hydrochloric acid in a sealed tube, the sultam ring is opened and the 2,4-sulfo groups are eliminated, with the formation of XLVI (R = H) (17).…”