trihydroxyferuloyl spermidine O-methyltransferase activity
trihydroxyferuloyl spermidine o-methyltransferase activity
Catalysis of the reaction: trihydroxyferuloyl spermidine + S-adenosyl-L-methionine = dihydroxyferuloyl-sinapoyl spermidine + S-adenosyl-L-homocysteine + H+.