p. 8379 - 8384
(1991)p. 2673 - 2679
(2007/10/03)25,26-diethoxy-27-benzoyloxy-28-hydroxycalix[4]arene
25-benzoyloxy-27-ethoxy-26,28-dihydroxycalix[4]arene
25,27-diethoxy-26-benzoyloxy-28-hydroxycalix[4]arene
25,26-dibenzoyloxy-27-ethoxy-28-hydroxycalix[4]arene
25-O-ethyl-27-O-(diethoxyphosphoryl)calix[4]arene