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