1-beta-D-Arabinofuranosyl-N(sup 4)-nonadecanoylcytosine 59252-39-0 BRN 0730933 CYTOSINE, 1-beta-D-ARABINOFURANOSYL-N(sup 4)-NONADECANOYL- N(sup 4)-Nonadecanoyl-1-beta-D-arabinofuranosylcytosine