Accuracy

1,4,5,6-tetrahydropyrimidine    611 1,4,5,6-Tetrahydropyrimidine

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    #  Species Formula
   601 ImidazoleC3H4N2
   602 1,2-PropanediamineC3H10N2
   603 DicyanoacetyleneC4N2
   604 FumaronitrileC4H2N2
   605 1,3-DiazineC4H4N2
   606 PyrazineC4H4N2
   607 PyridazineC4H4N2
   608 SuccinonitrileC4H4N2
   609 2-Methyl-1H-imidazoleC4H6N2
   610 (Dimethylamino) acetonitrileC4H8N2
   611 1,4,5,6-Tetrahydropyrimidine C4H8N2
   612 PiperazineC4H10N2
   613 2-AminopyridineC5H6N2
   614 3-AminopyridineC5H6N2
   615 4-AminopyridineC5H6N2
   616 Dimethyl propanedinitrileC5H6N2
   617 2-Ethyl-1H-imidazoleC5H8N2
   618 DiethylcyanamideC5H10N2
   619 ButylmethyldiazeneC5H12N2
   620 N,N-Dimethyl-1,3-propanediamineC5H14N2
   621 2-CyanopyridineC6H4N2


ΔHf: 13.2 kcal/mol,     REF: NIST Chemistry WebBook, NIST Standard Reference Database, No. 69; W. G. Mallard, P. J. Linstrom, Eds., National Institute of Standards and Technology, Gaithersberg, http://webbook.nist.gov/chemistry.
  
 PM7
1,4,5,6-Tetrahydropyrimidine
 H=13.2 HR=NIST
  N     0.00000000 +0    0.0000000 +0    0.0000000 +0     0     0     0
  C     1.45301494 +1    0.0000000 +0    0.0000000 +0     1     0     0
  C     1.54189626 +1  113.4149701 +1    0.0000000 +0     2     1     0
  C     1.53927021 +1  108.6874195 +1  -46.5256755 +1     3     2     1
  N     1.47435211 +1  112.3149510 +1   52.6489127 +1     4     3     2
  C     1.28660598 +1  120.8196691 +1   18.5519105 +1     1     2     3
  H     1.11416277 +1  108.5851357 +1 -123.3476197 +1     2     1     3
  H     1.11475324 +1  107.0345995 +1 -114.4172078 +1     2     1     7
  H     1.10227911 +1  110.8279883 +1 -121.6636154 +1     3     2     4
  H     1.10467349 +1  110.0872622 +1 -117.2198502 +1     3     2     9
  H     1.11639499 +1  109.6602179 +1 -118.9777973 +1     4     3     5
  H     1.10897848 +1  110.8497562 +1 -117.6203021 +1     4     3    11
  H     1.01121996 +1  114.7537133 +1  108.2203251 +1     5     4     3
  H     1.10287853 +1  119.2682306 +1 -178.1249785 +1     6     1     2