(4-(2-Pyridinyldithio)phenyl)methyl diazoacetate 117141-32-9 4-(2'-Pyridyldithio)benzyldiazoacetate Acetic acid, diazo-, (4-(2-pyridinyldithio)phenyl)methyl ester PPDA p-(2'-Pyridyldithio)benzyldiazoacetate