1-(3-ethylphenyl)-1-methyl-2-naphthalen-1-ylguanidine 1-(3-ethylphenyl)-1-methyl-2-(1-naphthyl)guanidine 1-(3-ethylphenyl)-1-methyl-2-naphthalen-1-yl-guanidine 137159-92-3 Lopac0_000312 Lopac-C-4238 NCGC00015236-01