124514-82-5
4,4,4',4'-bis-ethanediyldioxy-5,6,5',6'-diseco-β,β-carotene-6,6'-dione
→
105819-60-1
5,6,5',6'-diseco-β,β-carotene-4,6,4',6'-tetraone
514-78-3
斑蝥黄