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NIST X-ray Photoelectron Spectroscopy Database (SRD 20), Version 5.0

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(-C(O)NHC6H4CH2C6H4NHC(O)NHCH2CH2CH2NH-)n
(-C(O)NHC6H4CH2C6H4NHC(O)NHCH2CH2CH2NH-)n (C(2,3,4,5,6) of both rings = *)
poly(urea)
ketone, nitrogen, oxygen, phenyl benzene, polymer, urea

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