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