- Characterization of complicated new polymorphs of chlorothalonil by X-ray diffraction and computer crystal structure prediction. Tremayne, M., Grice, L., Pyatt, J.C., Seaton, C.C., Kariuki, B.M., Tsui, H.H., Price, S.L., Cherryman, J.C. J. Am. Chem. Soc. (2004)