[[Organic compound]]s contain carbon, usually in combination with [[hydrogen]], [[oxygen]], [[nitrogen]], or [[sulfur]]. Organic compounds were first associated only with [[plants]] and [[animals]]. However, a great number of organic compounds have now been prepared that do not occur in [[nature]]. | [[Organic compound]]s contain carbon, usually in combination with [[hydrogen]], [[oxygen]], [[nitrogen]], or [[sulfur]]. Organic compounds were first associated only with [[plants]] and [[animals]]. However, a great number of organic compounds have now been prepared that do not occur in [[nature]]. |