CHALLENGE #087

CHALLENGE #087

Find the missing letters?

R_m_a_

C_v_f_r

R_d_x

C_p_em_

Clue :

All four names can be connected to one name.

I am very important to India.

I was called by different names as mentioned above. 

My export has been banned by few countries.

I am the savior in this Covid world

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