reagent derivatized residue epicocconone derivatized residue (6S,9aS)-6-(hydroxymethyl)-3-[(1Z,4E,6E,8E)-1-hydroxy-3-oxodeca-1,4,6,8-tetraen-1-yl]-9a-methyl-5,6-dihydro-2H-furo[3,2-g]isochromene-2,9(9aH)-dione 410.136566162109375 410.420013427734375 A protein modification that is produced by formation of an adduct with epicocconone. C 23 H 22 O 7 Deep Purple LavaPurple Lightning Fast MOD:01666 PSI-MOD X artifact