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Using epitaxially grown graphene on Ru(0001) (G/Ru) as a buffer layer,the intrinsic molecular orbitals of perylene-3,4,9,10-tetracarboxylic (PTCDA),pentacene,and C60 molecules were imaged by means of scanning tunneling microscope (STM).Combined with density functional theory calculations,our high resolution STM images of the molecules reveal that the graphene layer decouples the individual molecules electronically from the metallic substrate.