4-[2-(tert-butylamino)-1-hydroxyethyl]-2-[[5-[2-(tert-butylamino)-1-hydroxyethyl]-2-hydroxyphenyl]methyl]-6-(hydroxymethyl)phenol; 4-(2-(tert-Butylamino)-1-hydroxyethyl)-2-(5-(2-(tert-butylamino)-1-hydroxyethyl)-2-hydroxybenzyl)-6-(hydroxymethyl)phenol