5-fluorocytosine/isocytosine monohydrate. The first example of isomorphic and isostructural co-crystal of pyrimidine nucleobases
To date, despite the crucial role played by cytosine, uracil, and thymine in the DNA/RNA replication process, no examples showing isomorphic and isostructural behavior among binary co-crystals of natural or modified pyrimidine nucleobases have been so far reported in the literature.