ATOM   CHEMICAL  BOND LENGTH    BOND ANGLE     TWIST ANGLE
   NUMBER  SYMBOL    (ANGSTROMS)     (DEGREES)      (DEGREES)
    (I)                  NA:I          NB:NA:I      NC:NB:NA:I     NA   NB   NC

      1      C       
      2      H         1.06000  *                                  1
      3      H         1.06000  *     109.47000  *                 1    2