Chemistry informtion about Tyrothricin (CAS NO.1404-88-2) is:
IUPAC Name: 3-[(3R,6S,9S,12S,15S,17S,20S,22R,25S,28S)-20-(2-amino-2-Oxoethyl)-9-(3-Aminopropyl)-3,22,25-Tribenzyl-15-[(4-Hydroxyphenyl)Methyl]-6-(2-Methylpropyl)-2,5,8,11,14,18,21,24,27-Nonaoxo-12-Propan-2-Yl-1,4,7,10,13,16,19,23,26-Nonazabicyclo[26.3.0]Hentriacontan-17-Yl]Propanoic Acid
Synonyms: 3-[(3R,6S,9S,12S,15S,17S,20S,22R,25S,28S)-20-(2-Amino-2-Oxo-Ethyl)-9-(3-Aminopropyl)-3,22,25-Tribenzyl-15-[(4-Hydroxyphenyl)Methyl]-6-Isobutyl-12-Isopropyl-2,5,8,11,14,18,21,24,27-Nonaoxo-1,4,7,10,13,16,19,23,26-Nonazabicyclo[26.3.0]Hentriacontan-17-Yl]Propanoic Acid
MF: C₆₅H₈₅N₁₁O₁₃
MW: 1228.436300 g/mol
Density: 1.32 g/cm³
Flash Point: 871 °C
Boiling Point: 1516.6 °C at 760 mmHg 
Enthalpy of Vaporization: 245.34 kJ/mol
Following is the molecular structure of Tyrothricin (CAS NO.1404-88-2) is:

Tyrothricin (CAS NO.1404-88-2) can cause the throat, gastric mucosa, and angina. Condition for the application is that the mucous membrane itself is still intact, so there is no contact with the bloodstream and therefore no risk of systemic absorption.

Poison by intraperitoneal and intravenous routes. Mutation data reported. Incompatible with alkalies, strong acids. 
Safety Statements:
S22:Do not breathe dust. 
S24/25:Avoid contact with skin and eyes.
WGK Germany: 2
RTECS: YP2975000

Tyrothricin (CAS NO.1404-88-2) is a cyclic polypeptide-antibiotic mixture from Bacillus brevis. It is a locally effective antibiotic effective against gram-positive bacteria. It is sometimes combined with benzocaine 5mg to provide relief from sore throats. In systemic intake can lead to severe side effects, therefore, the use is limited to topical application. It belongs pharmacologically closely related compounds such as colistin, polymyxin B and bacitracin to the group of polypeptide antibiotics. There are no cross-resistance to these three agents.Known hypersensitivity reactions are common, temporary loss of balance (see Vestibular system) and nephrotoxic effects, ie Impairment of renal function. There are no long term studies about its effect on pregnancy and lactation.