14.1. what do the origin of the following drugs: codeine, caffeine, morphine and digoxin have in common. a they are animal byproducts. b they were most likely derived from herbal medicines. c they come form trees. d none of the above 14.2 starting with crude plant sample, a medicinal chemist's job is to isolate . a all the different compounds in the plant b fractions (mixtures) that contain the active ingredient c isolate active ingredient in high purity d run chemical analyses on the crude mixture 14.3 the active ingredient first isolated from willow trees was a salicyl alcohol b salicin c salicyl aldehyde d salicylic acid e acetlysalicylic acid