While this paper was under review, reports of the seventh blind test results of crystal structure prediction organized by the CCDC were published. Compound XXXI is the only molecule in this blind test that is relevant for agrochemical and pharmaceutical development and has experimental forms with only Z'=1 structures. Three experimental structures of XXXI were determined. However, Form C is a channel-type solvate containing unresolved solvent and therefore falls outside the scope of prediction. Form A contains two disorder components resulting from the flipping of the fluorinated ring, and form B was determined by competitive slurry experiments as the most stable form below 55°C with form A becoming more stable for temperatures above 55°C.