Brown sugar is a mixture, the main component is sucrose, accounting for more than 89%. . . Molasses is a by-product of sucrose production. Its composition, taste and nutrition are different, so it can't be replaced. But the price of molasses should be cheaper than brown sugar. I don't know why you use brown sugar instead of molasses. . Molasses can be bought in sugar factories. . . . You can find it anywhere in Guangxi and Yunnan.