Summary Treatment of rhizopterin with alkali or acid gave a pterin-like degradation product, aporhizopterin, with the formula CI~ HI~ N~ OJ. A comparison of the physical properties of this compound with those of vitamin Bc indicated that these compounds appear to have identical chromophoric groups and differ orily in that vitamin B, contains additional non- ultraviolet absorbing mass.
![Benzoic acid,4-[[(2-amino-3,4-dihydro-4-oxo-6-pteridinyl)methyl]formylamino]- Structure](https://image.chemsrc.com/caspic/077/119-20-0.png)