26134-70-3 4-26-00-02701 (Beilstein Handbook Reference) 5,5'-(1,3-Pentadien-1-yl-5-ylidene)dibarbituric acid 63811-39-2 BRN 0343925 Barbituric acid, 5,5'-(1,3-pentadien-1-yl-5-ylidene)di- Pentamethinedibarbituric acid