(R)-5-methyl-tetronate + o-quinone methide <=> peniphenone D
(r)-5-methyl-tetronate + o-quinone methide <=> peniphenone d
(R)-5-methyl-tetronate + o-quinone methide <=> peniphenone D
(r)-5-methyl-tetronate + o-quinone methide <=> peniphenone d