Task: Question Answering
Input (English): Question: The infrared spectrum of procaine hydrochloride shows an intense band about 1700 cm-1. What information does this data provide about its structure? 
 Options:  <1> It has an aromatic ring. <2> It has a carbonyl group. <3> It is a tertiary amine. <4> It is an aromatic amine. <5> It is a salt.
Output (English): 2