Beta-lactamase inhibitors' structures

[a_zed24]

Hello, there!
Sorry if this is not the right place to ask this, but our Prof. was explaining the Beta-lactamase inhibitors and he mentioned the following:
-Clavulanic acid
-Sulbactam
-Tazobactam

-Avibactam
-Vaboractam
-Relebactam

And then he said that the last three are structurally different from the first three. He asked us why's that...
I've searched on Google and my answer would be that the last three do not have a Beta-lactam ring in their structure... do you think this is correct? Is there anything else I'm missing out?
Thanks a lot in advance!

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[BC_89]

1) This is the PCAT discussion subforum.
2) SDN is not the place for getting homework done.

closing thread.