I agree with you!
As a matter of fact, a Google search resulted in essentially one hit from 3 months ago on answers.yahoo.com and the person answering a question regarding the structural diagram of N-ethylpent-4-enoate came to the same conclusion you did.
Now, when I asked the student...
A student I am tutoring has asked me to help him formulate a synthesis pathway for the compound N-ethylpent-4-enoate.
I have spent countless hours trying to determine the structural formula for this compound without success.
I must be missing something so obvious... Like leaves in a...