How to pronounce“sestet”in English

A sestet on carbon.

Those future events are glimpsed in the sestet of this poem, in the final six lines.

Or if you have a sestet, instead of an octet, how bad is it?

Prof: Sestet there, sestet on the right too.

Okay, but that carbon has a sestet; the others are octet ones.

You've now got an octet on carbon but you got a sestet on nitrogen, and bad charge, negative on carbon; not so great.

Now -- oh pardon me, they don't all have octets, that one on the right has a sestet, because the carbon's making two bonds; so it gets three electrons out