mySQL中删除unique key的语法

CREATE TABLE `good_booked` (
`auto_id` int(10) NOT NULL auto_increment,
`good_id` int(11) default NULL,
`chemist_id` int(11) default NULL,
PRIMARY KEY (`auto_id`),
UNIQUE KEY `good_id` (`good_id`,`chemist_id`),
KEY `current_state` (`current_state`),
KEY `send_time` (`send_time`)
)
想删除某个表中某个字段的unique key：

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ALTER TABLE good_booked DROP INDEX good_id;