To assess the performance of our best model in correctly reporting [metal, linker] combinations which are known not to form MOFs, we select a small dataset of negative samples by combining eight samples that did not yield a MOF despite being extensively studied in our group and six [metal, linker] combinations taken from the study conducted by Banerjee et al. focusing on the high-throughput synthesis of ZIFs via 9600 micro-reactions involving combinations of zinc(II)/cobalt(II) and nine different imidazolate/imidazolate-type linkers. In the field of materials synthesis, a significant obstacle in attaining negative samples with certainty lies in the potential ambiguity surrounding synthesis failures. While it is difficult to definitively assert the impossibility of synthesising a MOF using the given [metal, linker] combination under all possible conditions, unsuccessful synthesis attempts for these 14 combinations still indicate that the researchers invested considerable effort (30-50 attempted reactions performed by an expert chemist for each combination) but no MOF was produced.