(3S)-3-(tert-Butyldimethylsilyloxy)-4-[(5'S)-5'-methyl-2'-oxo-2',5'-dihydrofuran-3'-yl]butanal

(5S)-3-[(2'S)-2',4'-Bis(tert-butyldimethylsilyloxy)butyl]-5-methylfuran-2(5H)-one

(5S)-3-{(2'R)-2'-tert-Butyldimethylsilyloxy-9'-[(2''R,5''S)-5''-(hydroxymethyl)terahydrofuran-2''-yl]nonyl}-5-methylfuran-2(5H)-one

(5S)-3-{(2'R)-2'-tert-Butyldimethylsilyloxy-9'-{(2''R,5''S)-5''-[(triethylsilyloxy)methyl]terahydrofuran-2''-yl}nonyl}-5-methylfuran-2(5H)-one

4,19,23-O-Tris(tert-butyldimethylsilyl)mucocin