42 : 294-298 ) , were used and the resultant sphingosylphosphocholine ( spc ) was converted to sm using two acylation methods : using fatty acid imidazolide to yield the o-acyl , n-acyl spc , followed by mild alkaline hydrolysis for selective deacylation at the o-acyl linkage , and selective acylation at the amino group of spc using the free fatty acid in the presence of dicyclohexylcarbodimide .
C0015684
fatty acid
C0015688
free fatty acid