'A chemical compound of the group NH-CO-O; you're probably familiar with the "poly" form'
urethane
I KNOW UR: A chemical compound of the group NH-CO-O; youre probably familiar with the poly form
A chemical compound of the group NH-CO-O; you're probably familiar with the "poly" form
A chemical compound of the group NH-CO-O; you're probably familiar with the "poly" form
I KNOW "UR"
urethane
I KNOW "UR"