Calone or methylbenzodioxepinone, trade-named Calone 1951, also known in the industry as "watermelon ketone", was discovered by Pfizer in 1966.
In 1966, Pfizer discovered Calone or methylbenzodioxepinone, which was later named Calone and referred to as "watermelon ketone" within the industry. This compound was identified that year.