The invention comprises (1) 6-benzylaminopurine which in the solid state has a melting point of at least 235 DEG C. and (2) the preparation of 6-benzylaminopurine by heating adenine with benzaldehyde and formic acid and/or a metal formate. Specifications 713,259, 713,286, 759,316, 767,216 and 854,560 are referred to.
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