Crystal structures of four indole derivatives with a phenyl substituent at the 2-position and a carbonyl group at the 3-position : the C(6) N-H⋯O chain remains the same, but the weak reinforcing inter-actions are different

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Acknowledgements We thank the EPSRC National Crystallography Service (University of Southampton) for the data collections and the EPSRC National Mass Spectrometry Service (University of Swansea) for the HRMS data.