preferred_name: (R)-5-methyl-tetronate + o-quinone methide <=> peniphenone D
preferred_name_lc: (r)-5-methyl-tetronate + o-quinone methide <=> peniphenone d
label: (R)-5-methyl-tetronate + o-quinone methide <=> peniphenone D
label_lc: (r)-5-methyl-tetronate + o-quinone methide <=> peniphenone d