The Collaborative International Dictionary of English v.0.48:

Naphthalenic \Naph`tha*len"ic\, a. (Chem.)
   Pertaining to, or derived from, naphthalene; -- used
   specifically to designate a yellow crystalline substance,
   called naphthalenic acid and also hydroxy quinone, and
   obtained from certain derivatives of naphthol.
   [1913 Webster]