The prefix nor- in a drug name means that there is ________.
◦ one less methyl group on the nitrogen atom in the new molecule than in the original
◦ one less amine in the new molecule than in the original
◦ one less double bond in the new molecule than in the original
◦ one more amine in the new molecule than in the original
◦ one more methyl group on the nitrogen atom in the new molecule than in the original