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The He-3 NMR of He-3@C60H6, He-3@C70H2, He-3@C70H4, He-3@C70H8 and He-3@C70
H10 have been investigated. A new, unidentified C60H6 isomer has been found
by using He-3 NMR, He-3@C70H10 shows the most downfield-shifted 3He NMR re
sonance among the neutral C-70 derivatives.