The molecules in our title are:

P	5-Bromo-oxazole	C3H2BrNO
C	Hydrogen peroxide	H2O2
H	Hyrdazine	N2H4
E	Carbonic Acid	H2CO3
M	Calcium hypochlorite	Ca(OCl)2

As you can see, we have higly distorted the structures to make them look like letters.