Cartblanche22 for 3D. Cartblanche has a 3D tranche browser (Figure ) to allow the user to select areas of chemical space according to heavy atom count, calculated logP, and charge, as well as file format. The user can also select the method of download. The user browses to cartblanche22.docking.org and from the menu selects tranches and then either 2D or 3D. (Figure ). We suggest using the selection tool (top right) to select lead-like or perhaps one of the other 10 pre-defined subsets, and then fine-tuning the selection by clicking either on individual tranches or on row and column headings. Select the desired charge from the charge selector (top center).