1-Piperidinyloxy, 2,2,6,6-tetramethyl-4-(((5,6,7,8-tetrahydro-8-hydroxy-7-(hydroxymethyl)-5-(3,4,5-trimethyoxyphenyl)naphtho(2,3-d)-1,3-dioxol-6-yl)carbonyl)hydrazono)-, (5R-(5alpha,6alpha,7beta,8alpha))- 116003-93-1 Paphnr Podophyllic acid piperidyl hydrazone nitroxide radical