Abstract: The present invention relates to the use of a compound of formula (1): wherein: R1 comprises a carbonyl group and R2 is a hydrocarbyl group; optionally wherein said ring is further substituted; or a pharmaceutically acceptable salt thereof; in the manufacture of a medicament for use in one or more of: modulating the release of intracellular calcium from a store controlled by nicotinic acid adenine dinucleotide phosphate; modulating calcium spikes in mammalian cells; treating diseases in one or more of brain, heart, pancreatic cells (e.g. pancreatic acinar and pancreatic beta cells), immune cells, T-cells, haemopoietic cells including phagocytes; treating diseases in one or more of brain, heart, pancreatic cells (e.g.