Hi dear siesta users

in my system "benzene which is functionalized by methyl group" ,if  I want 
tohave the coop file which is related to interaction between C_2pz  carbon of 
bnezene  and C_2pz carbon of methyl, how should I specify in my mpr file?
in my mpr file I wrote
COOP
C2pz-C2pz
C_2pz
1     2
C_2pz
thanks a lot for your attention

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