What would a Chemical Engineer call a 7 plex?

A Septex?

Someone asked me about multi unit, and wondered if a 7 unit building would be a septex. That got me thinking about organic chemistry names for multi units.

Ethplex
Propex
Butex
Pentex (not to be confused with the camera)
Sextex (that sounds kinky)
Septex
Octex
Nonex
Decex

OK.. time to get back to work!