"Similar chemicals" refers to substances or compounds that have comparable properties or structures. These chemicals may share certain characteristics, compositions, or reactions. Full definition
Since glucose and vitamin C have similar chemical structures, it's easy and cheap to produce fake vitamin C from sugar, typically using corn. (philmaffetone.com)
But if they were born in the same cluster, stars should have similar chemical signatures. (newscientist.com)
Further, this single instrument provides a wider field than similar chemical techniques and allows scientists to see individual particles without additional preparation that could modify the native structure. (pnnl.gov)