What are the 7 ketones with formula C6H12O

I only know 6 of them:
CH3COCH2CH2CH2CH3
CH3CH2COCH2CH2CH3
CH3CH(CH3)COCH2CH3
CH3CH(CH3)CH2COCH3
CH3C(CH3)2COCH3
CH3COCH(CH3)CH2CH3

Whats the seventh ketone?

Those are the only structural isomers that jump out at me, but your last one has a chiral carbon atom and thus exists as a pair of enantiomers. That must be the seventh.