| abstract |
1,169,624. Preparation of 5<SP>1</SP>-nucleotides. KYOWA HAKKO KOGYO CO. Ltd. 30 Aug., 1967 [7 Sept., 1966], No. 39710/67. Heading C2C. 1 - # - D - Ribofuranoside - 5<SP>1</SP> - phosphoric and pyrophosphoric acid esters of 1H-pyrazolo- (3,4-d) pyrimidine of the formula where R 1 and R 2 represent H, OH or NH 2 and X represents -P(O)(OH) 2 , -P(O)(OH)-O-P(O)(OH) 2 or -P(O)(OH)-O-P(O)(OH) 2 -O-P(O)(OH) 2 are prepared by cultivating a micro-organism in an aqueous culture medium containing a compound of the formula where R 3 is H or the group Many suitable micro-organisms are disclosed. |