8-allyl-2,2-di-tert-butyl-5a,6a-dimethyl-dodecahydro-1,3,5,7,12-pentaoxa-2-silacyclohepta[b]anthracen-9-ol

2,2-di-tert-butyl-7-(4,4-dimethoxybutyl)-6,10a-dimethyl-octahydro-1,3,8,10-tetraoxa-2-sila-anthracen-6-ol

2,2-di-tert-butyl-5a,6a-dimethyl-4a,5a,6,6a,10,11,11a,12a,13,13a-decahydro-4H-1,3,5,7,12-pentaoxa-2-sila-cyclohepta[b]anthracene