165337-66-6 4-(4-Methyl-1-piperazinyl)-2,7,9-trimethylpyrido(3',2':4,5)thieno(3,2-d)pyrimidine LM-2616 Pyrido(3',2':4,5)thieno(3,2-d)pyrimidine, 4-(4-methyl-1-piperazinyl)-2,7,9-trimethyl-