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     #     GUI   Heat of formation (Kcal/formula unit) Geometry        Species
                    Ref.        PM7     PM6-D3H4      PM7 PM6-D3H4 
  1994  (JSmol)                  559.9          119.9           12.0         7.5   Er Complex Sparkle (BOWXOA) 
  1995  (JSmol)                -801.5        -922.7           12.7       12.2   Er Complex Sparkle (DIYNII) 
  1996  (JSmol)                  -30.0        -345.5           12.3       11.4   Er Complex Sparkle (HAGSAJ) 
  1997  (JSmol)                  128.2        -299.3           19.5       25.8   Er Complex Sparkle (ICSD 200097) 
  1998  (JSmol)                    17.6        -279.3           37.7       18.0   Er Complex Sparkle (ICSD 34473) 
  1999  (JSmol)                -569.8        -956.6           38.4       26.7   Er Complex Sparkle (ICSD 413883) 
  2000  (JSmol)                -210.7        -519.8           24.6       24.6   Er Complex Sparkle (LEYJII) 
  2001  (JSmol)                  625.0          117.9           27.1       26.4   Er Complex Sparkle (XOXXAJ)