pentaerythritol1,1,1-tris(hydroxymethyl)ethanol2,2-bis(hydroxymethyl)-1,3-propanediolPETPTHMEmethane tetramethylolmono pentaerythritolmonopentaerythritolpentaerythritetetra(hydroxymethyl)methanetetrahydroxymethylmethanetetrakis(hydroxymethyl)methanetetramethylolmethane