Custom mix of C0-C4 alkyl PAHs 1-Methylnaphthalene 0712.11 1,3-Dimethylnaphthalene 0722.12 2,3,5-Trimethylnaphthalene 0706.13 1,4,6,7-Tetramethylnaphthalene 0707.14 1-Methylfluorene 0350.14 1,7-Dimethylfluorene 0908.15 9-n-Propylfluorene 1694.16 Dib