Question: 1. Predict, giving a reason for the prediction, the most likely general effect of the stated structural change on either the in situ stability or

1. Predict, giving a reason for the prediction, the most likely general effect of the stated structural change on either the in situ stability or the pharmacological action of the stated drug.

(a) The introduction of ortho ethyl groups in dimethylaminoethyl 4-aminobenzoate.

(b) The replacement of the amino group in the CNS stimulant amphetamine (PhCH2CH(NH2)CH3) by a trimethylammonium chloride group.

(c) The replacement of the ester group in the local anaesthetic ethyl 4-aminobenzoate (benzocaine).

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