3221376 p-NPC p-nitrophenyl chloroformate 4 3221377 p-NPC p-nitrophenyl-cellobioside 2 3221375 p-NPC p-nitrophenyl caprylate 1 3221378 p-NPC para-nitrophenyl caprate 1 3221379 p-NPC primary NPC tissues prior to radiotherapy 1