preferred_name: ergothioneine (thione form) + H(+) <=> ergothioneine
preferred_name_lc: ergothioneine (thione form) + h(+) <=> ergothioneine
label: ergothioneine (thione form) + H(+) <=> ergothioneine
label_lc: ergothioneine (thione form) + h(+) <=> ergothioneine