preferred_name: ethane + methanethiol + A => methyl ethyl sulfide + AH2
preferred_name_lc: ethane + methanethiol + a => methyl ethyl sulfide + ah2
label: ethane + methanethiol + A => methyl ethyl sulfide + AH2
label_lc: ethane + methanethiol + a => methyl ethyl sulfide + ah2