sentence2_structure: An amine<>is<>an organic compound that can be considered to be a derivative of ammonia$$$an organic compound<>to be<>a derivative of ammonia
sentence1: AMINES Alkyl derivatives of ammonia are called amines.
sentence2: An amine is an organic compound that can be considered to be a derivative of ammonia.
question: An amine is an organic compound that can be considered to be a derivative of what?