So the symbol D or L designates the absolute configuration of the stereogenic carbon, the chiral carbon, that is farthest away from the aldehyde or ketone group. And in this particular case, it happens to be the aldehyde group. Now, in deisomers, the oh points to the right side, and in L isomers, it points to the left side. So if this is the left side and this is the right side, then that means in this particular case, it points to the right side, and in this particular case, it points to the left side. So L, you could remember as left, and D is the opposite of left. So that's right.