Three minor hydroxycinnamic acid spermidines were isolated from pollen of Quercus dentata, and identified as N¹-feruloyl-N⁵,N¹⁰-dicaffeoylspermidine, N¹-p-coumaroyl-N⁵-caffeoyl-N¹⁰-feruloylspermidine, and as N¹,N⁵-di-p-coumaroyl-N¹⁰-caffeoylspermidine.