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H. I. Mosberg, R. Hurst, V. J. Hruby, K. Gee, H. I. Yamamura, J. J. Galligan and T. F. Burks, “Bis-Penicil- lamine Enkephalins Possess Highly Improved Specificity toward Delta Opioid Receptors,” Proceedings of the National Academy of Sciences USA, Vol. 80, No. 19, 1983, pp. 5871-5874. doi:10.1073/pnas.80.19.5871

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