1,8-Naphthalide 1-Naphthalenecarboxylic acid, 8-(hydroxymethyl)-, .delta.-lactone 1-Naphthoic acid, 8-(hydroxymethyl)-, .delta.-lactone 1H,3H-Naphtho[1,8-cd]pyran-1-one 518-86-5 NSC11845 Naphthalid Naphthalide Perinaphthalide peri-Naphthalide