ydrogen atom, and n=1: A most preferred protecting group, methyl-6-nitroveratryl (MeNV), which is used for protecting the carboxyl terminus of an amino acid or the hydroxyl group of a nucleotide, sugar or carbohydrate for example, is formed when R2 and R3 are each a methoxy group, R1 and R4 are each a hydrogen atom, R5 is a methyl group, and n=0: Another most preferred protecting group, methyl-6-n