preferred_name: penilactone A => peniphenone D + o-quinone methide + H(+)
preferred_name_lc: penilactone a => peniphenone d + o-quinone methide + h(+)
label: penilactone A => peniphenone D + o-quinone methide + H(+)
label_lc: penilactone a => peniphenone d + o-quinone methide + h(+)