definiens: shall mean a chemical compound structurally derived in oneor more steps from another by a process of modification or partial substitution of at least onecomponent wherein at least one structural feature is retained at each process step . A DerivativeCompound may be synthesized ( i ) from a parent compound through manipulation of the parentcompound or ( ii ) from a compound or compounds other than the parent compound if the DerivativeCompound could have been synthesized from the parent compound but a different synthetic pathwaywas used . The number of intermediate steps or compounds is not relevant to the classification of acompound as a Derivative Compound . A compound need not have structural similarity to anothercompound in order to be classified as a Derivative Compound . However, a compound is not aDerivative Compound merely because the compound is, in theory, a synthetically accessiblecompound from a parent compound ; rather, a Derivative Compound results from a series of syntheticsteps that are actually undertaken in an effort to produce a desired end - product in a particulardevelopment program