# CHARMM CCD
    O13  O12
    O12  O13
    C210 C30
    C211 C47
    C212 C48
    C213 C49
    C214 C50
    C215 C51
    C216 C52
    C310 C40
    C311 C41 
    C312 C42
    C313 C43
    C314 C44
    C315 C45
    C316 C46
