. . . . "CSP: general term for synthetic or natural chemical compounds which resemble naturally occurring compounds in structure and/or function.,NCI: In chemistry, a substance that is similar, but not identical, to another.,NCI: A synthetic chemical which structurally or functionally resembles a naturally occurring compound." . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .