sigmaaldrich
![10,11-二氢二苯并[b,f][1,4]噁杂-11-酮](https://resources.chemdig.com/resources/cas/3158-85-8.gif)
250ML
![双环[2.2.2]辛-7-烯-2,3,5,6-四羧酸二酐](https://resources.chemdig.com/resources/cas/1719-83-1.gif)
500MG
