| http://www.w3.org/ns/prov#value | - Typically, phosphoramidite nucleoside monomer units include: where, R1 is a protecting group or substituent, e.g. cyanoethyl, methyl, lower alkyl, substituted alkyl, phenyl, aryl, and substituted aryl; R2 and R3 are amine substituents, e.g. isopropyl, morpholino, methyl, ethyl, lower alkyl, cycloalkyl, and aryl; R4 is an exocyclic nitrogen protecting group such as benzoyl, isobutyryl, acetyl, phen
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