preferred_name: (n-1) sulfur + hydrogen sulfide + H(+) => n sulfur + H2
preferred_name_lc: (n-1) sulfur + hydrogen sulfide + h(+) => n sulfur + h2
label: (n-1) sulfur + hydrogen sulfide + H(+) => n sulfur + H2
label_lc: (n-1) sulfur + hydrogen sulfide + h(+) => n sulfur + h2