peniphenone D + o-quinone methide + H(+) <=> penilactone A
peniphenone d + o-quinone methide + h(+) <=> penilactone a
peniphenone D + o-quinone methide + H(+) <=> penilactone A
peniphenone d + o-quinone methide + h(+) <=> penilactone a