C2H4O4P
APtclcactv03241713342D 0   0.00000     0.00000
 
 11 10  0  0  0  0  0  0  0  0999 V2000
    5.1350    0.0000    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.1350   -0.6200    0.0000 H   0  0  0  0  0  0  0  0  0  0  0  0
    4.2690    0.5000    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.4030    0.0000    0.0000 P   0  0  0  0  0  0  0  0  0  0  0  0
    2.9030    0.8660    0.0000 O   0  5  0  0  0  0  0  0  0  0  0  0
    2.5369   -0.5000    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    3.9030   -0.8660    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    6.0010    0.5000    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    4.6675    0.9749    0.0000 H   0  0  0  0  0  0  0  0  0  0  0  0
    3.8705    0.9749    0.0000 H   0  0  0  0  0  0  0  0  0  0  0  0
    2.0000   -0.1900    0.0000 H   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  1  0  0  0  0
  1  3  1  0  0  0  0
  3  4  1  0  0  0  0
  4  5  1  0  0  0  0
  4  6  1  0  0  0  0
  4  7  2  0  0  0  0
  1  8  2  0  0  0  0
  3  9  1  0  0  0  0
  3 10  1  0  0  0  0
  6 11  1  0  0  0  0
M  CHG  1   5  -1
M  END
> <UNIQUE_SMILES>
O[P]([O-])(=O)CC=O

> <USER_SUPPLIED_SMILES>
[CH](CP([O-])(O)=O)=O

$$$$
