... Vol. ... chromatographed on neutral alumina (1% MeOH - CH2C1,) to afford a mixture of the cyclized products (28 and 29) as an oil (17 mg, 26 ... the product exists mainly as the open chain deoxypentulose 27 (66%), together with a 1 : 1 mixture of the anomeric a and p furanoses 28 ...