3,5-Di-t-butyl-2-hydroxybenzaldehyde is a salicylaldehyde derivative with antibacterial activity used in the preparation nickel complexes. 3,5-Di-t-butyl-2-hydroxybenzaldehyde is structurally related to 3,5-di-t-butylcatechol (DTCAT) but is not as potent an activator of rat skeletal muscle ryanodine receptor Ca2+ channel (RyRC).