That would be a Cm pent in G. Overlapping the G min pent
and Cm pent would give you a G7b13 (adding the 3rd from a G maj pent give you the change perfectly). For playing American music, my major scale is an overlapped pent. A major and a minor together. Overlapping pents covers just about every scale possibilities there are. Moving form 2 minor on top of form 1 minor gives you the major pent. Play any of your standard licks. Fuse or overlapp gives endless possibilities. Take a look at this site. Simply and hopefully, explains the logic.

http://members.tripod.com/~griphon2/index-17.html