3',3''-bis(phenylmethyl)trispiro[tricyclo[3.3.1.13,7]decane-2,5'-
[1,3,2]oxazagermolidine-2',2''-[1,3,2]oxazagermolidine-5'',2'''-
tricyclo[3.3.1.13,7]decane]
Arduengo, A. J., III; Dixon, D. A.; Roe, D. C.;Kline, M. J. Am. Chem. Soc., 1988, 110, 4437. 
Click and drag over structure to rotate.