Citation: Duedal, Troels; Nielsen, Kent A.; Olsen, Gunnar; Rasmussen, Charlotte B. G.; Kongsted, Jacob; Levillain, Eric; Breton, Tony; Miyazaki, Eigo; Takimiya, Kazuo; B\"ahring, Steffen; Jeppesen, Jan O. (2017). Very Strong Binding for a Neutral Calix[4]pyrrole Receptor Displaying Positive Allosteric Binding.. The Journal of organic chemistry, 82, pp. 2123-2128.