Diethyl 5-[(2-hydr-oxy-1-naphth-yl)methyl-ideneamino]-3-methyl-thio-phene-2,4-dicarboxyl-ate

Diethyl 5-[(2-hydr-oxy-1-naphth-yl)methyl-ideneamino]-3-methyl-thio-phene-2,4-dicarboxyl-ate