preferred_name: penilactone D + o-quinone methide + H(+) <=> penilactone B
preferred_name_lc: penilactone d + o-quinone methide + h(+) <=> penilactone b
label: penilactone D + o-quinone methide + H(+) <=> penilactone B
label_lc: penilactone d + o-quinone methide + h(+) <=> penilactone b