This is an update using the rules from January 29, 2020:
2015: Critical Evaluation of Thermochemical Properties of C-1-C-4 Species: Updated Group-Contributions to Estimate Thermochemical Properties
2018: Extensive Theoretical Study of the Thermochemical Properties of Unsaturated Hydrocarbons and Allylic and Super-Allylic Radicals: The Development and Optimization of Group Additivity Values
entered by m_raza@sjtu.edu.cn