preferred_name: 2 vanillin => 1,2-bis(4-hydroxy-3-methoxyphenyl)ethylene + O2
preferred_name_lc: 2 vanillin => 1,2-bis(4-hydroxy-3-methoxyphenyl)ethylene + o2
label: 2 vanillin => 1,2-bis(4-hydroxy-3-methoxyphenyl)ethylene + O2
label_lc: 2 vanillin => 1,2-bis(4-hydroxy-3-methoxyphenyl)ethylene + o2