PN C2220C226MMR2L7186 is included in the upcoming KPS 2220 63V SnPb 
release this quarter 2021. 

Although, letters have generally meant 'higher voltages', M = 63V 
here. The datasheet link that Mark Perez referred to below is for high 
voltage parts. 

However, the edit for this release will eventually be placed in this 
datasheet: 
https://content.kemet.com/datasheets/KEM_C1089_X7R_KPS_SnPb.pdf 
Please contact technical sales representative for further assistance