. "The chemical reactions and pathways resulting in the breakdown of methylnaphthalene, an organic compound, C10H7CH3, obtained from coal tar." . . . . . "methylnaphthalene catabolic process" . "1-methylnaphthalene catabolic process" . "1-methylnaphthalene catabolism" . "1-MN catabolic process" . "1-MN catabolism" . "2-methylnaphthalene catabolic process" . "2-methylnaphthalene catabolism" . "2-MN catabolic process" . "2-MN catabolism" . .