Butanox M-60
Butanox M-60, Methyl ethyl ketone peroxide, CAS 1338-23-4, Organic peroxide, Butanox® M-60 is a medium-reactive, general purpose MEKP with low water content, 10% higher active oxygen compared to Butanox® M-50.
https://www.nouryon.com/product/butanox-m-60-methyl-ethyl-ketone-peroxide-cas-1338-23-4/