7234-99-3 4,13-dimethyl-4a,5,8,9,19,20-hexahydro-2H,13H,18H-4,5:12,13-dimethanodipyrano[3,4-g:4',3'-n][1,4,9,13]tetraoxacycloheptadecine-2,6,11,15(4H,12H,12aH)-tetrone 7235-51-0 [nonacyclo[14.6.6.6~5,12~.0~2,15~.0~4,13~.0~6,11~.0~17,22~.0~23,28~.0~29,34~]tetratriaconta-2(15),3,6,8,10,13,17,19,21,23,25,27,29,31,33-pentadecaene-3,14-diyldiethyne-2,1-diyl]bis(trimethylsilane) (non-preferred name)