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We present high resolution photoassociation spectroscopy of ultracold 23Na133Cs molecules in a long-range c3∑+ state below the (3S1/2 q-6P3/2) asymptote.We perform photoassociation spectroscopy in a dual-species magneto-optical trap (MOT) and detect the photoassociation resonances using trap-loss spectroscopy.By fitting the experimental data with the semi-classical LeRoy-Bestein formula,we deduce the long-range molecular coefficient C6 and derive the empirical potential energy curve in the long-range region.