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Schematic diagram of the solar nebula. Synthesis of 15N-rich PANHs inside the ice is possible, while PAHs and 15N-rich nitrile and amine functional groups are frozen in ice and exposed to UV photons. The source of 15N enrichment is the VUV photodissociation as shown in the present study. PANHs are incorporated in the chondritic parent bodies as organic macromolecules at a later stage.
