Nonahydroxytriphenic acid is a moiety found in some ellagitannins such as roburin A, B,C and D, castalagin or grandinin.
References
Nonahydroxytriphenic acid Wikipedia(Text) CC BY-SA
Nonahydroxytriphenic acid is a moiety found in some ellagitannins such as roburin A, B,C and D, castalagin or grandinin.