preferred_name: (S)-5-carboxymethyl-tetronate + o-quinone methide = penilactone D + H(+)
preferred_name_lc: (s)-5-carboxymethyl-tetronate + o-quinone methide = penilactone d + h(+)
label: (S)-5-carboxymethyl-tetronate + o-quinone methide = penilactone D + H(+)
label_lc: (s)-5-carboxymethyl-tetronate + o-quinone methide = penilactone d + h(+)