Keywords Electronic structure;Optimized configuration;R Thiazolidine 2 thione 4 carboxylic acid;Bistetrahydrothiazolidine 2 thione 2 dioxo hydropyrazine;

• 电子结构;最优构型;R-四氢噻唑-2-硫酮-4-羧酸;双四氢噻唑-2-硫酮并二氧代氢化吡嗪;