preferred_name: propanoate + succinyl-CoA => propanoyl-CoA + succinate
preferred_name_lc: propanoate + succinyl-coa => propanoyl-coa + succinate
label: propanoate + succinyl-CoA => propanoyl-CoA + succinate
label_lc: propanoate + succinyl-coa => propanoyl-coa + succinate