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The Structure of Nitroso Methane. It has the molecular formulae CH3 NO. This structure is saved in a *.mol format.

Haemoglobin, whose structure is given above, is a molecule that is involved in the process of oxygen transport as it behaves as a respiratory pigment. It contains a coloured non-protein portion known as heam that is linked to a protein molecule.
Haemoglobin is red colour due to the oxygen carrying pigment. Haemoglobin is able to combine reversibly with oxygen to form oxy-haemoglobin in areas of higher O2 concentration, and releases oxygen in areas of lower oxygen concentration.
Haemoglobin has a quaternary structure where it contains four separate polypeptide chains of two types, two alpha chains( containing 141 amino acids each) and two beta chains (containing 146 amino acids each).  This molecular structure is saved in the *.pdb format.