23880
The synthesis of novel pyrimidine deoxyapiothionucleosides of d - and l - series was realized following application of a versatile and high - yielding scheme , which utilized inexpensive l - and d - arabinose as starting materials , respectively , and which makes use of a regio - and stereo - selective Pummerer rearrangement reaction for the coupling of the nucleobase with the thiosugar moiety .
 Chemical: pyrimidine deoxyapiothionucleosides; Chemical: l - and d - arabinose; Chemical: nucleobase; Chemical: thiosugar
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: pyrimidine deoxyapiothionucleosides; Chemical: l - and d - arabinose; Chemical: nucleobase; Chemical: thiosugar