It is theoretically shown that spectral fine structures due to the intramolecular H-1-H-1 dipolar couplings and the C-13-H-1 J-couplings can be observed in uniaxially rotating molecules magnetically isolated from the surroundings when the C-13 spectrum is observed under magic-angle spinning without H-1-decoupling. Such fine structures were observed for [2-C-13]decane molecules enclathrated in deuterated urea channels.