4-coumaric acid3-(4-hydroxyphenyl)-2-propenoic acid3-(4-hydroxyphenyl)acrylic acid4'-hydroxycinnamic acid4-coumaric acid4-hydroxycinnamic acidbeta-[4-hydroxyphenyl]acrylic acidp-coumaric acidp-hydroxycinnamic acidp-hydroxyphenylacrylic acidpara-coumaric acid